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Questions: 170

Resolved: 170

Answers: 263

Views : 76743

Avg time to answer : 1.4 days
38455
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872
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1
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Getting an error when running KNN algorithm on Project
559
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933
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4
answers
Error: undefined columns selected, when running dummy(x)
506
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894
days
6
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Not Enough Distinct Predictions to compute area under ROC.
455
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904
days
3
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R error: infinite or missing values in 'x' when running svd(subs_mat)
416
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926
days
1
answers
Large Graded Partner Assignment Question
400
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852
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1
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Random Forest error on calibration function
374
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901
days
3
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Question about the NYSE dataset for Large Assignment  heavily skewed dependent variable
372
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873
days
10
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Error running LR with glmnet
367
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851
days
1
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WHAT DATA
348
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933
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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)
347
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871
days
1
answers
Error from AUC function on KNN algorithm
337
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880
days
7
answers
Euclidean Distance for KNearest Neighbors
320
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933
days
4
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How to keep the same structure of a data frame when appying functions to it?
305
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853
days
1
answers
Text mining after SVD
303
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902
days
1
answers
How to use your newly computed v and d to calculate u on the second half of the data?
301
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899
days
1
answers
Meaning of negative AUC (in Round 1 results)
294
views
930
days
1
answers
How to compute the time window in model deployment?
287
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929
days
1
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How to compute a lag on a variable?
285
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902
days
1
answers
Output of the KNN algorithm question > Prediction or probability
281
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903
days
3
answers
Warning in install.packages : package â€˜imputeâ€™ is not available (for R version 3.2.3)
278
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929
days
1
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Best Way to Attempt Homework
278
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929
days
1
answers
did you mean to say flag or lag in the exercise?
276
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851
days
7
answers
predKNN Error: "Error in matrix(data = predKNN, ncol = k, nrow = nrow(testKNN)) : nonnumeric matrix extent"
275
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892
days
1
answers
Lead variable for predictions
275
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879
days
4
answers
Create a bagged tree and tune the ensemble size
274
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865
days
1
answers
RandomForest Prediction in Project
273
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901
days
1
answers
Prediction Algorithm Output and what it means: If all my predNB values are under 0.50, is it ever guessing "YES?"
272
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851
days
1
answers
Output for 5x2fcv function?
272
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880
days
2
answers
2.8.4 Exercises for Subsection 2.5.5
269
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929
days
1
answers
What is the difference between characters, numerics, factors, and integers?
267
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866
days
6
answers
Error Received in Decision Tree
265
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928
days
1
answers
Can you please clarify what you are asking for when you want predictors from 5 columns?
263
views
879
days
3
answers
Max AUC (bagged trees)
263
views
899
days
1
answers
How do we write the predict function to give predictions for specific stocks?
261
views
879
days
1
answers
KNearest Neighbors "for loop"
260
views
877
days
1
answers
How to manually compute KNN
260
views
899
days
3
answers
HW#2: Calculating Second Half of SUBS dataset
258
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879
days
1
answers
kNN Calculated Proportions
258
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906
days
1
answers
How to manually compute proportions of 1s using k nearest neighbors in R?
256
views
871
days
1
answers
GLM/GLMNET Multinomial/Binomial error
256
views
838
days
1
answers
Logistic Regression Log Lambda / Coefficients Graph Explanation
253
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853
days
1
answers
Optimizing bins for calibration
253
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892
days
3
answers
Predicting Using Naive Bayes
252
views
908
days
1
answers
What is the response variable for the Group Stock Price Project?
249
views
901
days
1
answers
Large Assignment: Input / Output and function deliverables
248
views
894
days
1
answers
Coaching Marketplace: Can coaches meet with different teams?
247
views
892
days
2
answers
Threading in R
247
views
876
days
1
answers
Leading variable
247
views
845
days
1
answers
Passing variables between functions
247
views
861
days
1
answers
Big Project Articles Text mining: Merging 2 data sets
246
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866
days
1
answers
Bagged Trees Prediction
244
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880
days
1
answers
taking Y of the nearest neighbors
244
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837
days
1
answers
Exam length
242
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903
days
1
answers
What is the purpose of svd?
241
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845
days
2
answers
DATA_GRADING data from 2002 missing
240
views
879
days
1
answers
What is meant by "Estimation phase: Create a big ensemble with many trees only once"
239
views
892
days
2
answers
AUC
239
views
906
days
1
answers
Breaking a "tie" for Knearest neighbors
239
views
893
days
5
answers
Reading .csv files as Dataframe
235
views
894
days
1
answers
Question sapply about
235
views
873
days
1
answers
Difference between BasetableTRAIN, BasetableVAL, BasetableTEST, and BasetableTRAINbig
234
views
859
days
2
answers
How to execute R code inside a string variable?
232
views
906
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?
229
views
843
days
1
answers
Comprising a 5x2cfv
229
views
876
days
1
answers
Why use AUC?
229
views
894
days
1
answers
kNN.index vs. knn
228
views
899
days
1
answers
How to use validation method on two separate data sets (test data= jan2nd & train data=prev.yr data+jan1st data)
227
views
892
days
2
answers
Sorting by stock symbol
227
views
929
days
1
answers
What does putting "as." in front of numeric or factor accomplish?
227
views
857
days
1
answers
Is it better to delete row of NA's or impute mode?
227
views
894
days
1
answers
What to do if a rm command was used when it shouldn't have been?
226
views
843
days
1
answers
Summarizing CrossValidation Performance Values
226
views
879
days
1
answers
Using NaiveBayes() function that does not have the right criteria
225
views
852
days
3
answers
Not enough memory to run RF on the Stocks data
224
views
876
days
1
answers
Dependent Variable
223
views
928
days
1
answers
Homework due dates
223
views
839
days
1
answers
Explain node impurity further
222
views
929
days
1
answers
How to combine two functions with differing outputs and equations?
222
views
894
days
3
answers
Coaching Marketplace
221
views
853
days
1
answers
Choosing a good title
220
views
870
days
1
answers
Text mining: how to aggregate unstructured data in Large Assignment News Articles
219
views
880
days
1
answers
Finding the Optimal # of Trees
219
views
880
days
1
answers
Second intermediate deliverable: predictions
218
views
853
days
1
answers
Does the WilcoxonRanks Test function need to only work for 10 AUC scores at the .05 level?
218
views
854
days
1
answers
Using Random Forest
218
views
871
days
1
answers
submitting LR
217
views
863
days
1
answers
Large assignment question about merging
215
views
853
days
1
answers
How to select number of dates in test set
215
views
697
days
1
answers
Test Material Usage
214
views
894
days
1
answers
kNN in class dependent variable
213
views
720
days
2
answers
Viewing Prep Quiz answers
213
views
895
days
1
answers
First Prediction Wednesday Model
213
views
866
days
1
answers
Using the mapping.csv file with Article Data
212
views
843
days
1
answers
AUC ROC calculation explored
211
views
866
days
3
answers
Tuning in Decision Trees
211
views
879
days
2
answers
HW#3 Question 1: Medium Tenure, High Spend
210
views
846
days
3
answers
Reading in new data
209
views
865
days
1
answers
Round 4 Why are there so many unmatched Symbols?
208
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848
days
1
answers
what does it mean  return indicators
208
views
877
days
1
answers
Discriminating between neighbors in Knearest neighbors where distance measures are equal
207
views
868
days
3
answers
Determining optimal number of trees  Exercise 2.8.6
207
views
848
days
1
answers
Clarification on Final Code Deliverable
207
views
849
days
1
answers
What do we do if our calibrated predictions are incorrect?
206
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845
days
2
answers
New data passed with ensemble of models?
206
views
857
days
1
answers
yTEST
205
views
907
days
1
answers
What is the significance of document vector weighting?
204
views
876
days
1
answers
Independent and dependent variables for predictions
204
views
845
days
2
answers
How to combine multiple models for final submission
203
views
850
days
1
answers
Number of bins for plotting Calibration and bin classifier scores
203
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723
days
1
answers
Viewing of the Solutions to the InClass Gradable
203
views
879
days
1
answers
Computing Probabilities manually with Bayes Theorem.
202
views
845
days
1
answers
Matching symbols with predictions in the predict function
202
views
884
days
1
answers
Predicting Probabilities of New (X,Y) Using Naive Bayes
201
views
876
days
1
answers
How to manually calculate AUC?
201
views
865
days
1
answers
Round 3 Data
200
views
851
days
1
answers
How do we structure a data frame for stacking models?
200
views
854
days
2
answers
The datasets.Rdata file location
200
views
840
days
2
answers
Requesting a summary of results from Stock Prediction final submission
200
views
845
days
1
answers
When to install.packages for grader
199
views
845
days
1
answers
Should I subtract colMeans from my DTM matrix when I am recreating it in the predict function?
199
views
865
days
1
answers
Optimal Ensemble Size Exercise 2.8.6 for section 2.5.7
197
views
868
days
1
answers
Neural Network Calculation: Entropy Term, etc.
197
views
857
days
1
answers
Manually Evaluate Neural Network
196
views
850
days
1
answers
Getting a better smoothed fit for plot
195
views
698
days
1
answers
Defining the classes of columns while reading in data
195
views
845
days
1
answers
Splitting a Table Without Hardcoding
195
views
875
days
1
answers
Loop with letters instead of numbers
193
views
854
days
1
answers
What's the difference between Predictions and Predictions 2
193
views
865
days
1
answers
Defining Validation data vs training data
192
views
832
days
1
answers
Cross Validation Optimal Parameter Consistency
191
views
542
days
3
answers
what do you mean when you use the word 'handling'?
191
views
667
days
1
answers
Second Test Allowed Material Usage
189
views
864
days
1
answers
Inner merging DF with cardinality of manytomany
185
views
845
days
1
answers
columns.txt file in Data Grading folder
185
views
858
days
1
answers
NAs in Dataset from Lead Variable
183
views
846
days
1
answers
MERGE() command Techniques
183
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727
days
5
answers
Computer Error on the First Prep Quiz
181
views
832
days
2
answers
Cross Validation & Wilcoxon Solutions
179
views
848
days
1
answers
Wilcoxon assingment
177
views
662
days
1
answers
"idf" function
176
views
849
days
1
answers
graphing function takes labels as argument
171
views
705
days
1
answers
How would && operators increase efficiency?
171
views
848
days
1
answers
Wilcoxon signedranks test: Value of parameter "p" in the critical values table
170
views
848
days
1
answers
Deploying the model given by the calibrate function on unbinned or binned data?
152
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636
days
1
answers
When do we perform variable selection outside of regression?
145
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619
days
1
answers
How select the sequence parameter to use in a loop while trying to determine the optimal K for a KNN model
131
views
511
days
3
answers
Do we need to train the model on train+test set again after finding optimal ensemble size?
130
views
576
days
1
answers
Data Frame subsetted with logical types FALSE, TRUE
129
views
496
days
1
answers
Features in Support Vector Machines
128
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470
days
1
answers
Support Vector Machines and figure 2.15
126
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529
days
1
answers
Figure 2.8 and equation 2.24
124
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529
days
2
answers
Good Predictions
123
views
531
days
1
answers
The difference between using predict() on BasetableVAL and BasetableTEST
122
views
538
days
1
answers
Viewing files before reading into R using notepad
121
views
535
days
3
answers
Naive Bayes: How can we tell when to tune data?
120
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539
days
1
answers
combining rbind and lapply  the reasoning behind not using them together
120
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509
days
1
answers
Bagged Decision Tree vs. Random Forest
118
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505
days
1
answers
Something forgotten before an important dealine
118
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529
days
1
answers
Double colon?
118
views
531
days
2
answers
In binomial likelihood function why is number of trials equal to 1
118
views
534
days
1
answers
Creating identical percentages of 1's and 0's efficiently
117
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500
days
2
answers
ICA #19 Solution
114
views
482
days
1
answers
Understanding classifier performance
107
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490
days
1
answers
AUACC vs AUROC curves
3
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17
days
0
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3
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17
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3
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17
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2
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17
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2
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17
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2
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17
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