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Questions: 164 | Resolved: 164 | Answers: 255 | Views : 36204 | Avg time to answer : 1.2 days




522
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876
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4
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Error: undefined columns selected, when running dummy(x)




481
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836
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6
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Not Enough Distinct Predictions to compute area under ROC.




399
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868
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1
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Large Graded Partner Assignment Question




387
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847
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3
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R error: infinite or missing values in 'x' when running svd(subs_mat)




356
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795
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1
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Random Forest error on calibration function




356
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844
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3
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Question about the NYSE dataset for Large Assignment - heavily skewed dependent variable




354
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794
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1
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WHAT DATA




338
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876
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1
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Can you clarify the following statement: Compute the the sum by both ID1 and ID2 ? -HW1 Exercise4 (due 2/1)-




334
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815
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10
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Error running LR with glmnet




322
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822
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7
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Euclidean Distance for K-Nearest Neighbors




308
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876
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4
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How to keep the same structure of a data frame when appying functions to it?




299
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814
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1
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Error from AUC function on KNN algorithm




297
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814
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1
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Getting an error when running KNN algorithm on Project




292
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795
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1
answers
Text mining after SVD




292
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845
days
1
answers
How to use your newly computed v and d to calculate u on the second half of the data?




288
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841
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1
answers
Meaning of negative AUC (in Round 1 results)




285
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873
days
1
answers
How to compute the time window in model deployment?




278
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871
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1
answers
How to compute a lag on a variable?




273
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845
days
1
answers
Output of the KNN algorithm question -> Prediction or probability




269
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846
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3
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Warning in install.packages : package ‘impute’ is not available (for R version 3.2.3)




266
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822
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4
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Create a bagged tree and tune the ensemble size




266
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872
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1
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did you mean to say flag or lag in the exercise?




265
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871
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1
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Best Way to Attempt Homework




263
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793
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1
answers
Output for 5x2fcv function?




263
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835
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1
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Lead variable for predictions




261
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807
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1
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RandomForest Prediction in Project




260
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823
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2
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2.8.4 Exercises for Subsection 2.5.5




260
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844
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1
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Prediction Algorithm Output and what it means: If all my predNB values are under 0.50, is it ever guessing "YES?"




255
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793
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7
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predKNN Error: "Error in matrix(data = predKNN, ncol = k, nrow = nrow(testKNN)) : non-numeric matrix extent"




253
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821
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1
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K-Nearest Neighbors "for loop"




252
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871
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1
answers
Can you please clarify what you are asking for when you want predictors from 5 columns?




252
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822
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3
answers
Max AUC (bagged trees)




252
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842
days
1
answers
How do we write the predict function to give predictions for specific stocks?




252
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872
days
1
answers
What is the difference between characters, numerics, factors, and integers?




249
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849
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1
answers
How to manually compute proportions of 1s using k nearest neighbors in R?




249
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808
days
6
answers
Error Received in Decision Tree




247
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842
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3
answers
HW#2: Calculating Second Half of SUBS dataset




246
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822
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1
answers
kNN Calculated Proportions




244
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780
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1
answers
Logistic Regression Log Lambda / Coefficients Graph Explanation




242
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850
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1
answers
What is the response variable for the Group Stock Price Project?




241
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796
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1
answers
Optimizing bins for calibration




240
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835
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3
answers
Predicting Using Naive Bayes




239
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803
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1
answers
Big Project Articles Text mining: Merging 2 data sets




237
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837
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1
answers
Coaching Marketplace: Can coaches meet with different teams?




237
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814
days
1
answers
GLM/GLMNET Multinomial/Binomial error




237
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844
days
1
answers
Large Assignment: Input / Output and function deliverables




237
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788
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1
answers
Passing variables between functions




236
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835
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2
answers
Threading in R




236
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809
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1
answers
Bagged Trees Prediction




236
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780
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1
answers
Exam length




233
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819
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1
answers
Leading variable




233
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822
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1
answers
taking Y of the nearest neighbors




232
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846
days
1
answers
What is the purpose of svd?




231
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788
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2
answers
DATA_GRADING data from 2002 missing




230
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835
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2
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AUC




230
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822
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1
answers
What is meant by "Estimation phase: Create a big ensemble with many trees only once"




229
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849
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1
answers
Breaking a "tie" for K-nearest neighbors




229
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836
days
5
answers
Reading .csv files as Dataframe




226
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820
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1
answers
How to manually compute KNN




226
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815
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1
answers
Difference between BasetableTRAIN, BasetableVAL, BasetableTEST, and BasetableTRAINbig




223
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802
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2
answers
How to execute R code inside a string variable?




221
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837
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1
answers
kNN.index vs. knn




220
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837
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1
answers
Question sapply about




219
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842
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1
answers
How to use validation method on two separate data sets (test data= jan2nd & train data=prev.yr data+jan1st data)




219
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849
days
1
answers
Why do we sometimes use the transpose function back to back, and how do we recognize when it is appropriate to do so?




217
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786
days
1
answers
Comprising a 5x2cfv




217
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819
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1
answers
Why use AUC?




217
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800
days
1
answers
Is it better to delete row of NA's or impute mode?




217
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822
days
1
answers
Using NaiveBayes() function that does not have the right criteria




216
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835
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2
answers
Sorting by stock symbol




216
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872
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1
answers
What does putting "as." in front of numeric or factor accomplish?




215
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785
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1
answers
Summarizing Cross-Validation Performance Values




215
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794
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3
answers
Not enough memory to run RF on the Stocks data




215
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837
days
1
answers
What to do if a rm command was used when it shouldn't have been?




213
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871
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1
answers
Homework due dates




212
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819
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1
answers
Dependent Variable




211
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871
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1
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How to combine two functions with differing outputs and equations?




211
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814
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1
answers
submitting LR




211
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836
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3
answers
Coaching Marketplace




211
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823
days
1
answers
Second intermediate deliverable: predictions




211
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781
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1
answers
Explain node impurity further




209
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797
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1
answers
Using Random Forest




208
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796
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1
answers
Does the Wilcoxon-Ranks Test function need to only work for 10 AUC scores at the .05 level?




208
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823
days
1
answers
Finding the Optimal # of Trees




208
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795
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1
answers
Choosing a good title




207
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837
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1
answers
kNN in class dependent variable




206
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795
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1
answers
How to select number of dates in test set




204
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806
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1
answers
Large assignment question about merging




204
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837
days
1
answers
First Prediction Wednesday Model




202
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663
days
2
answers
Viewing Prep Quiz answers




202
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809
days
1
answers
Using the mapping.csv file with Article Data




202
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822
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2
answers
HW#3 Question 1: Medium Tenure, High Spend




201
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786
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1
answers
AUC ROC calculation explored




201
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812
days
1
answers
Text mining: how to aggregate unstructured data in Large Assignment News Articles




201
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808
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3
answers
Tuning in Decision Trees




200
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789
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3
answers
Reading in new data




200
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640
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1
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Test Material Usage




199
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791
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1
answers
Clarification on Final Code Deliverable




198
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808
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1
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Round 4 Why are there so many unmatched Symbols?




198
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792
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1
answers
What do we do if our calibrated predictions are incorrect?




197
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810
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3
answers
Determining optimal number of trees - Exercise 2.8.6




197
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791
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1
answers
what does it mean - return indicators




196
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820
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1
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Discriminating between neighbors in K-nearest neighbors where distance measures are equal




196
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800
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1
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yTEST




196
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788
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2
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How to combine multiple models for final submission




195
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819
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1
answers
Independent and dependent variables for predictions




195
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788
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2
answers
New data passed with ensemble of models?




194
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793
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1
answers
Number of bins for plotting Calibration and bin classifier scores




194
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850
days
1
answers
What is the significance of document vector weighting?




194
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826
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1
answers
Predicting Probabilities of New (X,Y) Using Naive Bayes




193
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808
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1
answers
Round 3 Data




193
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788
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1
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Matching symbols with predictions in the predict function




192
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819
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1
answers
How to manually calculate AUC?




192
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808
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1
answers
Optimal Ensemble Size Exercise 2.8.6 for section 2.5.7




192
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821
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1
answers
Computing Probabilities manually with Bayes Theorem.




191
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794
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1
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How do we structure a data frame for stacking models?




191
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797
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2
answers
The datasets.Rdata file location




190
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787
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1
answers
Should I subtract colMeans from my DTM matrix when I am recreating it in the predict function?




190
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783
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2
answers
Requesting a summary of results from Stock Prediction final submission




189
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788
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1
answers
When to install.packages for grader




188
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792
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1
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Getting a better smoothed fit for plot




188
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787
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1
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Splitting a Table Without Hardcoding




188
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800
days
1
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Manually Evaluate Neural Network




187
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810
days
1
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Neural Network Calculation: Entropy Term, etc.




187
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665
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1
answers
Viewing of the Solutions to the In-Class Gradable




185
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796
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1
answers
What's the difference between Predictions and Predictions 2




184
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808
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1
answers
Defining Validation data vs training data




184
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818
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1
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Loop with letters instead of numbers




182
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641
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1
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Defining the classes of columns while reading in data




181
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807
days
1
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Inner merging DF with cardinality of many-to-many




181
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610
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1
answers
Second Test Allowed Material Usage




180
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775
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1
answers
Cross Validation Optimal Parameter Consistency




176
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788
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1
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columns.txt file in Data Grading folder




175
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800
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1
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NAs in Dataset from Lead Variable




172
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789
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1
answers
MERGE() command Techniques




172
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670
days
5
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Computer Error on the First Prep Quiz




172
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791
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1
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Wilcoxon assingment




172
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775
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2
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Cross Validation & Wilcoxon Solutions




167
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605
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1
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"idf" function




167
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792
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1
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graphing function takes labels as argument




162
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791
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1
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Deploying the model given by the calibrate function on unbinned or binned data?




160
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791
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1
answers
Wilcoxon signed-ranks test: Value of parameter "p" in the critical values table




159
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648
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1
answers
How would && operators increase efficiency?




143
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579
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1
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When do we perform variable selection outside of regression?




135
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562
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1
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How select the sequence parameter to use in a loop while trying to determine the optimal K for a KNN model




121
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454
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3
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Do we need to train the model on train+test set again after finding optimal ensemble size?




120
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485
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1
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what do you mean when you use the word 'handling'?




120
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519
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1
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Data Frame subsetted with logical types FALSE, TRUE




117
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472
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1
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Figure 2.8 and equation 2.24




116
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439
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1
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Features in Support Vector Machines




116
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412
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1
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Support Vector Machines and figure 2.15




115
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472
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2
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Good Predictions




113
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474
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1
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The difference between using predict() on BasetableVAL and BasetableTEST




112
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481
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1
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Viewing files before reading into R using notepad




111
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482
days
1
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combining rbind and lapply -- the reasoning behind not using them together




111
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452
days
1
answers
Bagged Decision Tree vs. Random Forest




110
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478
days
3
answers
Naive Bayes: How can we tell when to tune data?




109
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472
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1
answers
Double colon?




109
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474
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2
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In binomial likelihood function why is number of trials equal to 1




109
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477
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1
answers
Creating identical percentages of 1's and 0's efficiently




107
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443
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2
answers
ICA #19 Solution




107
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447
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1
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Something forgotten before an important dealine




103
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425
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1
answers
Understanding classifier performance




96
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433
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1
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AUACC vs AUROC curves