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Questions: 170 | Resolved: 170 | Answers: 263 | Views : 85147 | Avg time to answer : 6.7 days




38585
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1023
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Getting an error when running KNN algorithm on Project




628
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1045
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6
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Not Enough Distinct Predictions to compute area under ROC.




627
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1084
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4
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Error: undefined columns selected, when running dummy(x)




549
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1055
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3
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R error: infinite or missing values in 'x' when running svd(subs_mat)




516
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1028
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1
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How to manually compute KNN




499
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1024
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10
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Error running LR with glmnet




487
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1003
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1
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Random Forest error on calibration function




469
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1022
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1
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Error from AUC function on KNN algorithm




466
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1077
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1
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Large Graded Partner Assignment Question




415
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1052
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3
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Question about the NYSE dataset for Large Assignment - heavily skewed dependent variable




411
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1002
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1
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WHAT DATA




394
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1084
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Can you clarify the following statement: Compute the the sum by both ID1 and ID2 ? -HW1 Exercise4 (due 2/1)-




389
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1031
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7
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Euclidean Distance for K-Nearest Neighbors




380
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1022
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1
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GLM/GLMNET Multinomial/Binomial error




369
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1084
days
4
answers
How to keep the same structure of a data frame when appying functions to it?




354
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1004
days
1
answers
Text mining after SVD




342
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1053
days
1
answers
How to use your newly computed v and d to calculate u on the second half of the data?




339
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1050
days
1
answers
Meaning of negative AUC (in Round 1 results)




336
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1017
days
6
answers
Error Received in Decision Tree




335
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1081
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1
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How to compute the time window in model deployment?




332
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1080
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1
answers
How to compute a lag on a variable?




328
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1080
days
1
answers
Best Way to Attempt Homework




326
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1002
days
7
answers
predKNN Error: "Error in matrix(data = predKNN, ncol = k, nrow = nrow(testKNN)) : non-numeric matrix extent"




324
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1053
days
1
answers
Output of the KNN algorithm question -> Prediction or probability




324
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1054
days
3
answers
Warning in install.packages : package ‘impute’ is not available (for R version 3.2.3)




322
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1080
days
1
answers
What is the difference between characters, numerics, factors, and integers?




320
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1016
days
1
answers
RandomForest Prediction in Project




320
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1030
days
4
answers
Create a bagged tree and tune the ensemble size




316
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1080
days
1
answers
did you mean to say flag or lag in the exercise?




315
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1043
days
1
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Lead variable for predictions




313
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1052
days
1
answers
Prediction Algorithm Output and what it means: If all my predNB values are under 0.50, is it ever guessing "YES?"




310
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1002
days
1
answers
Output for 5x2fcv function?




310
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1031
days
2
answers
2.8.4 Exercises for Subsection 2.5.5




307
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1079
days
1
answers
Can you please clarify what you are asking for when you want predictors from 5 columns?




305
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1030
days
3
answers
Max AUC (bagged trees)




304
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1030
days
1
answers
K-Nearest Neighbors "for loop"




303
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1050
days
1
answers
How do we write the predict function to give predictions for specific stocks?




302
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989
days
1
answers
Logistic Regression Log Lambda / Coefficients Graph Explanation




301
views
1050
days
3
answers
HW#2: Calculating Second Half of SUBS dataset




301
views
1057
days
1
answers
How to manually compute proportions of 1s using k nearest neighbors in R?




298
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1004
days
1
answers
Optimizing bins for calibration




294
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1030
days
1
answers
kNN Calculated Proportions




294
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1045
days
1
answers
Coaching Marketplace: Can coaches meet with different teams?




292
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1052
days
1
answers
Large Assignment: Input / Output and function deliverables




291
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1043
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3
answers
Predicting Using Naive Bayes




289
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1043
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2
answers
Threading in R




287
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1059
days
1
answers
What is the response variable for the Group Stock Price Project?




286
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996
days
1
answers
Passing variables between functions




286
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1012
days
1
answers
Big Project Articles Text mining: Merging 2 data sets




285
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1017
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1
answers
Bagged Trees Prediction




284
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1027
days
1
answers
Leading variable




283
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1043
days
2
answers
AUC




282
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1054
days
1
answers
What is the purpose of svd?




280
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1031
days
1
answers
taking Y of the nearest neighbors




280
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988
days
1
answers
Exam length




277
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996
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2
answers
DATA_GRADING data from 2002 missing




277
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1045
days
1
answers
Question sapply about




276
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994
days
1
answers
Summarizing Cross-Validation Performance Values




276
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1030
days
1
answers
What is meant by "Estimation phase: Create a big ensemble with many trees only once"




275
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1044
days
5
answers
Reading .csv files as Dataframe




272
views
1057
days
1
answers
Breaking a "tie" for K-nearest neighbors




270
views
1010
days
2
answers
How to execute R code inside a string variable?




269
views
994
days
1
answers
Comprising a 5x2cfv




268
views
1024
days
1
answers
Difference between BasetableTRAIN, BasetableVAL, BasetableTEST, and BasetableTRAINbig




266
views
1057
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?




265
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1045
days
1
answers
What to do if a rm command was used when it shouldn't have been?




264
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1027
days
1
answers
Why use AUC?




263
views
1027
days
1
answers
Dependent Variable




263
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1050
days
1
answers
How to use validation method on two separate data sets (test data= jan2nd & train data=prev.yr data+jan1st data)




262
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1045
days
1
answers
kNN.index vs. knn




261
views
1002
days
3
answers
Not enough memory to run RF on the Stocks data




260
views
1080
days
1
answers
What does putting "as." in front of numeric or factor accomplish?




260
views
990
days
1
answers
Explain node impurity further




259
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1043
days
2
answers
Sorting by stock symbol




258
views
1080
days
1
answers
How to combine two functions with differing outputs and equations?




257
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1030
days
1
answers
Using NaiveBayes() function that does not have the right criteria




257
views
848
days
1
answers
Test Material Usage




257
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1079
days
1
answers
Homework due dates




257
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1008
days
1
answers
Is it better to delete row of NA's or impute mode?




257
views
1004
days
1
answers
How to select number of dates in test set




256
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1014
days
1
answers
Large assignment question about merging




256
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1004
days
1
answers
Choosing a good title




254
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1021
days
1
answers
Text mining: how to aggregate unstructured data in Large Assignment News Articles




253
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871
days
2
answers
Viewing Prep Quiz answers




252
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1004
days
1
answers
Does the Wilcoxon-Ranks Test function need to only work for 10 AUC scores at the .05 level?




252
views
1022
days
1
answers
submitting LR




252
views
1031
days
1
answers
Finding the Optimal # of Trees




252
views
1031
days
1
answers
Second intermediate deliverable: predictions




251
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1045
days
3
answers
Coaching Marketplace




250
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1017
days
1
answers
Using the mapping.csv file with Article Data




249
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1030
days
2
answers
HW#3 Question 1: Medium Tenure, High Spend




249
views
994
days
1
answers
AUC ROC calculation explored




248
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997
days
3
answers
Reading in new data




248
views
1005
days
1
answers
Using Random Forest




246
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1045
days
1
answers
First Prediction Wednesday Model




246
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1028
days
1
answers
Discriminating between neighbors in K-nearest neighbors where distance measures are equal




245
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1045
days
1
answers
kNN in class dependent variable




244
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996
days
2
answers
How to combine multiple models for final submission




242
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849
days
1
answers
Defining the classes of columns while reading in data




242
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999
days
1
answers
what does it mean - return indicators




242
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1017
days
3
answers
Tuning in Decision Trees




241
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874
days
1
answers
Viewing of the Solutions to the In-Class Gradable




241
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1016
days
1
answers
Round 4 Why are there so many unmatched Symbols?




241
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996
days
2
answers
New data passed with ensemble of models?




241
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999
days
1
answers
Clarification on Final Code Deliverable




240
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1027
days
1
answers
Independent and dependent variables for predictions




240
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1058
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1
answers
What is the significance of document vector weighting?




239
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996
days
1
answers
When to install.packages for grader




239
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1019
days
3
answers
Determining optimal number of trees - Exercise 2.8.6




239
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1008
days
1
answers
yTEST




238
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991
days
2
answers
Requesting a summary of results from Stock Prediction final submission




238
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996
days
1
answers
Matching symbols with predictions in the predict function




237
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1035
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1
answers
Predicting Probabilities of New (X,Y) Using Naive Bayes




237
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1000
days
1
answers
What do we do if our calibrated predictions are incorrect?




237
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1016
days
1
answers
Round 3 Data




237
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1008
days
1
answers
Manually Evaluate Neural Network




235
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1027
days
1
answers
How to manually calculate AUC?




235
views
995
days
1
answers
Should I subtract colMeans from my DTM matrix when I am recreating it in the predict function?




234
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1005
days
2
answers
The datasets.Rdata file location




234
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1030
days
1
answers
Computing Probabilities manually with Bayes Theorem.




233
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1001
days
1
answers
Number of bins for plotting Calibration and bin classifier scores




233
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1016
days
1
answers
Optimal Ensemble Size Exercise 2.8.6 for section 2.5.7




233
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818
days
1
answers
Second Test Allowed Material Usage




232
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1019
days
1
answers
Neural Network Calculation: Entropy Term, etc.




232
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996
days
1
answers
Splitting a Table Without Hardcoding




231
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1002
days
1
answers
How do we structure a data frame for stacking models?




228
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1016
days
1
answers
Defining Validation data vs training data




227
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1026
days
1
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Loop with letters instead of numbers




227
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1001
days
1
answers
Getting a better smoothed fit for plot




227
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1005
days
1
answers
What's the difference between Predictions and Predictions 2




227
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693
days
3
answers
what do you mean when you use the word 'handling'?




227
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983
days
1
answers
Cross Validation Optimal Parameter Consistency




225
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1015
days
1
answers
Inner merging DF with cardinality of many-to-many




222
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997
days
1
answers
MERGE() command Techniques




221
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878
days
5
answers
Computer Error on the First Prep Quiz




220
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996
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1
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columns.txt file in Data Grading folder




219
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813
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1
answers
"idf" function




218
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983
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2
answers
Cross Validation & Wilcoxon Solutions




218
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1009
days
1
answers
NAs in Dataset from Lead Variable




212
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999
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1
answers
Wilcoxon assingment




211
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999
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1
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Wilcoxon signed-ranks test: Value of parameter "p" in the critical values table




209
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856
days
1
answers
How would && operators increase efficiency?




207
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1000
days
1
answers
graphing function takes labels as argument




203
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999
days
1
answers
Deploying the model given by the calibrate function on unbinned or binned data?




187
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787
days
1
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When do we perform variable selection outside of regression?




183
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770
days
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




172
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727
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1
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Data Frame subsetted with logical types FALSE, TRUE




169
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647
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1
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Features in Support Vector Machines




169
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621
days
1
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Support Vector Machines and figure 2.15




168
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662
days
3
answers
Do we need to train the model on train+test set again after finding optimal ensemble size?




163
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680
days
1
answers
Figure 2.8 and equation 2.24




162
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680
days
2
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Good Predictions




160
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686
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3
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Naive Bayes: How can we tell when to tune data?




160
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660
days
1
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Bagged Decision Tree vs. Random Forest




159
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682
days
2
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In binomial likelihood function why is number of trials equal to 1




158
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682
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1
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The difference between using predict() on BasetableVAL and BasetableTEST




157
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689
days
1
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Viewing files before reading into R using notepad




157
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680
days
1
answers
Double colon?




156
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651
days
2
answers
ICA #19 Solution




154
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685
days
1
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Creating identical percentages of 1's and 0's efficiently




154
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656
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1
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Something forgotten before an important dealine




154
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690
days
1
answers
combining rbind and lapply -- the reasoning behind not using them together




150
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633
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1
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Understanding classifier performance




141
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641
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1
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AUACC vs AUROC curves




41
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167
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41
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28
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