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Questions: 164

Resolved: 164

Answers: 255

Views : 36235

Avg time to answer : 1.2 days
524
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878
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4
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Error: undefined columns selected, when running dummy(x)
482
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838
days
6
answers
Not Enough Distinct Predictions to compute area under ROC.
399
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870
days
1
answers
Large Graded Partner Assignment Question
391
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849
days
3
answers
R error: infinite or missing values in 'x' when running svd(subs_mat)
356
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797
days
1
answers
Random Forest error on calibration function
356
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845
days
3
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Question about the NYSE dataset for Large Assignment  heavily skewed dependent variable
354
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796
days
1
answers
WHAT DATA
338
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878
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1
answers
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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817
days
10
answers
Error running LR with glmnet
323
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824
days
7
answers
Euclidean Distance for KNearest Neighbors
308
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878
days
4
answers
How to keep the same structure of a data frame when appying functions to it?
300
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816
days
1
answers
Error from AUC function on KNN algorithm
298
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816
days
1
answers
Getting an error when running KNN algorithm on Project
292
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797
days
1
answers
Text mining after SVD
292
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847
days
1
answers
How to use your newly computed v and d to calculate u on the second half of the data?
289
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843
days
1
answers
Meaning of negative AUC (in Round 1 results)
285
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875
days
1
answers
How to compute the time window in model deployment?
278
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873
days
1
answers
How to compute a lag on a variable?
273
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847
days
1
answers
Output of the KNN algorithm question > Prediction or probability
270
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848
days
3
answers
Warning in install.packages : package â€˜imputeâ€™ is not available (for R version 3.2.3)
267
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824
days
4
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Create a bagged tree and tune the ensemble size
266
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874
days
1
answers
did you mean to say flag or lag in the exercise?
265
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873
days
1
answers
Best Way to Attempt Homework
263
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795
days
1
answers
Output for 5x2fcv function?
263
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837
days
1
answers
Lead variable for predictions
262
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809
days
1
answers
RandomForest Prediction in Project
261
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846
days
1
answers
Prediction Algorithm Output and what it means: If all my predNB values are under 0.50, is it ever guessing "YES?"
260
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825
days
2
answers
2.8.4 Exercises for Subsection 2.5.5
256
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795
days
7
answers
predKNN Error: "Error in matrix(data = predKNN, ncol = k, nrow = nrow(testKNN)) : nonnumeric matrix extent"
253
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823
days
1
answers
KNearest Neighbors "for loop"
252
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873
days
1
answers
Can you please clarify what you are asking for when you want predictors from 5 columns?
252
views
824
days
3
answers
Max AUC (bagged trees)
252
views
844
days
1
answers
How do we write the predict function to give predictions for specific stocks?
252
views
874
days
1
answers
What is the difference between characters, numerics, factors, and integers?
249
views
851
days
1
answers
How to manually compute proportions of 1s using k nearest neighbors in R?
249
views
810
days
6
answers
Error Received in Decision Tree
248
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844
days
3
answers
HW#2: Calculating Second Half of SUBS dataset
246
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824
days
1
answers
kNN Calculated Proportions
244
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782
days
1
answers
Logistic Regression Log Lambda / Coefficients Graph Explanation
242
views
852
days
1
answers
What is the response variable for the Group Stock Price Project?
241
views
798
days
1
answers
Optimizing bins for calibration
241
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837
days
3
answers
Predicting Using Naive Bayes
239
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805
days
1
answers
Big Project Articles Text mining: Merging 2 data sets
237
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839
days
1
answers
Coaching Marketplace: Can coaches meet with different teams?
237
views
816
days
1
answers
GLM/GLMNET Multinomial/Binomial error
237
views
846
days
1
answers
Large Assignment: Input / Output and function deliverables
237
views
790
days
1
answers
Passing variables between functions
236
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811
days
1
answers
Bagged Trees Prediction
236
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837
days
2
answers
Threading in R
236
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782
days
1
answers
Exam length
233
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821
days
1
answers
Leading variable
233
views
824
days
1
answers
taking Y of the nearest neighbors
232
views
848
days
1
answers
What is the purpose of svd?
231
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790
days
2
answers
DATA_GRADING data from 2002 missing
230
views
837
days
2
answers
AUC
230
views
824
days
1
answers
What is meant by "Estimation phase: Create a big ensemble with many trees only once"
229
views
851
days
1
answers
Breaking a "tie" for Knearest neighbors
229
views
838
days
5
answers
Reading .csv files as Dataframe
226
views
822
days
1
answers
How to manually compute KNN
226
views
817
days
1
answers
Difference between BasetableTRAIN, BasetableVAL, BasetableTEST, and BasetableTRAINbig
223
views
804
days
2
answers
How to execute R code inside a string variable?
221
views
839
days
1
answers
kNN.index vs. knn
220
views
851
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?
220
views
839
days
1
answers
Question sapply about
219
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844
days
1
answers
How to use validation method on two separate data sets (test data= jan2nd & train data=prev.yr data+jan1st data)
217
views
788
days
1
answers
Comprising a 5x2cfv
217
views
821
days
1
answers
Why use AUC?
217
views
802
days
1
answers
Is it better to delete row of NA's or impute mode?
217
views
823
days
1
answers
Using NaiveBayes() function that does not have the right criteria
216
views
837
days
2
answers
Sorting by stock symbol
216
views
874
days
1
answers
What does putting "as." in front of numeric or factor accomplish?
216
views
796
days
3
answers
Not enough memory to run RF on the Stocks data
215
views
787
days
1
answers
Summarizing CrossValidation Performance Values
215
views
839
days
1
answers
What to do if a rm command was used when it shouldn't have been?
213
views
873
days
1
answers
Homework due dates
212
views
821
days
1
answers
Dependent Variable
211
views
873
days
1
answers
How to combine two functions with differing outputs and equations?
211
views
816
days
1
answers
submitting LR
211
views
838
days
3
answers
Coaching Marketplace
211
views
825
days
1
answers
Second intermediate deliverable: predictions
211
views
783
days
1
answers
Explain node impurity further
209
views
799
days
1
answers
Using Random Forest
209
views
797
days
1
answers
Choosing a good title
208
views
798
days
1
answers
Does the WilcoxonRanks Test function need to only work for 10 AUC scores at the .05 level?
208
views
824
days
1
answers
Finding the Optimal # of Trees
207
views
839
days
1
answers
kNN in class dependent variable
206
views
797
days
1
answers
How to select number of dates in test set
204
views
808
days
1
answers
Large assignment question about merging
204
views
839
days
1
answers
First Prediction Wednesday Model
203
views
810
days
1
answers
Using the mapping.csv file with Article Data
202
views
788
days
1
answers
AUC ROC calculation explored
202
views
665
days
2
answers
Viewing Prep Quiz answers
202
views
814
days
1
answers
Text mining: how to aggregate unstructured data in Large Assignment News Articles
202
views
824
days
2
answers
HW#3 Question 1: Medium Tenure, High Spend
201
views
810
days
3
answers
Tuning in Decision Trees
200
views
791
days
3
answers
Reading in new data
200
views
642
days
1
answers
Test Material Usage
199
views
793
days
1
answers
Clarification on Final Code Deliverable
198
views
810
days
1
answers
Round 4 Why are there so many unmatched Symbols?
198
views
794
days
1
answers
What do we do if our calibrated predictions are incorrect?
197
views
812
days
3
answers
Determining optimal number of trees  Exercise 2.8.6
197
views
793
days
1
answers
what does it mean  return indicators
196
views
802
days
1
answers
yTEST
196
views
822
days
1
answers
Discriminating between neighbors in Knearest neighbors where distance measures are equal
196
views
790
days
2
answers
How to combine multiple models for final submission
195
views
821
days
1
answers
Independent and dependent variables for predictions
195
views
790
days
2
answers
New data passed with ensemble of models?
194
views
795
days
1
answers
Number of bins for plotting Calibration and bin classifier scores
194
views
852
days
1
answers
What is the significance of document vector weighting?
194
views
828
days
1
answers
Predicting Probabilities of New (X,Y) Using Naive Bayes
193
views
809
days
1
answers
Round 3 Data
193
views
790
days
1
answers
Matching symbols with predictions in the predict function
192
views
821
days
1
answers
How to manually calculate AUC?
192
views
810
days
1
answers
Optimal Ensemble Size Exercise 2.8.6 for section 2.5.7
192
views
823
days
1
answers
Computing Probabilities manually with Bayes Theorem.
191
views
796
days
1
answers
How do we structure a data frame for stacking models?
191
views
799
days
2
answers
The datasets.Rdata file location
190
views
667
days
1
answers
Viewing of the Solutions to the InClass Gradable
190
views
789
days
1
answers
Should I subtract colMeans from my DTM matrix when I am recreating it in the predict function?
190
views
785
days
2
answers
Requesting a summary of results from Stock Prediction final submission
189
views
790
days
1
answers
When to install.packages for grader
188
views
794
days
1
answers
Getting a better smoothed fit for plot
188
views
789
days
1
answers
Splitting a Table Without Hardcoding
188
views
802
days
1
answers
Manually Evaluate Neural Network
187
views
812
days
1
answers
Neural Network Calculation: Entropy Term, etc.
186
views
798
days
1
answers
What's the difference between Predictions and Predictions 2
184
views
810
days
1
answers
Defining Validation data vs training data
184
views
820
days
1
answers
Loop with letters instead of numbers
183
views
643
days
1
answers
Defining the classes of columns while reading in data
181
views
809
days
1
answers
Inner merging DF with cardinality of manytomany
181
views
612
days
1
answers
Second Test Allowed Material Usage
180
views
777
days
1
answers
Cross Validation Optimal Parameter Consistency
176
views
790
days
1
answers
columns.txt file in Data Grading folder
175
views
802
days
1
answers
NAs in Dataset from Lead Variable
173
views
672
days
5
answers
Computer Error on the First Prep Quiz
172
views
791
days
1
answers
MERGE() command Techniques
172
views
793
days
1
answers
Wilcoxon assingment
172
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777
days
2
answers
Cross Validation & Wilcoxon Solutions
167
views
607
days
1
answers
"idf" function
167
views
794
days
1
answers
graphing function takes labels as argument
162
views
793
days
1
answers
Deploying the model given by the calibrate function on unbinned or binned data?
160
views
793
days
1
answers
Wilcoxon signedranks test: Value of parameter "p" in the critical values table
159
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650
days
1
answers
How would && operators increase efficiency?
143
views
581
days
1
answers
When do we perform variable selection outside of regression?
135
views
564
days
1
answers
How select the sequence parameter to use in a loop while trying to determine the optimal K for a KNN model
121
views
456
days
3
answers
Do we need to train the model on train+test set again after finding optimal ensemble size?
121
views
521
days
1
answers
Data Frame subsetted with logical types FALSE, TRUE
120
views
487
days
1
answers
what do you mean when you use the word 'handling'?
117
views
474
days
1
answers
Figure 2.8 and equation 2.24
116
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441
days
1
answers
Features in Support Vector Machines
116
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414
days
1
answers
Support Vector Machines and figure 2.15
115
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474
days
2
answers
Good Predictions
113
views
476
days
1
answers
The difference between using predict() on BasetableVAL and BasetableTEST
112
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483
days
1
answers
Viewing files before reading into R using notepad
111
views
484
days
1
answers
combining rbind and lapply  the reasoning behind not using them together
111
views
454
days
1
answers
Bagged Decision Tree vs. Random Forest
110
views
480
days
3
answers
Naive Bayes: How can we tell when to tune data?
109
views
474
days
1
answers
Double colon?
109
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476
days
2
answers
In binomial likelihood function why is number of trials equal to 1
109
views
479
days
1
answers
Creating identical percentages of 1's and 0's efficiently
107
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445
days
2
answers
ICA #19 Solution
107
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449
days
1
answers
Something forgotten before an important dealine
103
views
427
days
1
answers
Understanding classifier performance
96
views
435
days
1
answers
AUACC vs AUROC curves