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Questions: 170

Resolved: 170

Answers: 263

Views : 86474

Avg time to answer : 8.1 days
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30
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32
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46
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203
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182
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656
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Support Vector Machines and figure 2.15
154
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668
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Understanding classifier performance
145
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676
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AUACC vs AUROC curves
174
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682
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Features in Support Vector Machines
160
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686
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2
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ICA #19 Solution
159
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691
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Something forgotten before an important dealine
166
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695
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Bagged Decision Tree vs. Random Forest
172
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697
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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?
174
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715
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1
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Figure 2.8 and equation 2.24
163
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715
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Double colon?
168
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715
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2
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Good Predictions
166
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717
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2
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In binomial likelihood function why is number of trials equal to 1
164
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717
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1
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The difference between using predict() on BasetableVAL and BasetableTEST
161
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720
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1
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Creating identical percentages of 1's and 0's efficiently
165
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722
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3
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Naive Bayes: How can we tell when to tune data?
162
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725
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1
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Viewing files before reading into R using notepad
160
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725
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1
answers
combining rbind and lapply  the reasoning behind not using them together
233
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728
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3
answers
what do you mean when you use the word 'handling'?
178
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762
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1
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Data Frame subsetted with logical types FALSE, TRUE
187
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806
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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
192
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822
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1
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When do we perform variable selection outside of regression?
224
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849
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1
answers
"idf" function
241
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854
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1
answers
Second Test Allowed Material Usage
265
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883
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1
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Test Material Usage
249
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884
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1
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Defining the classes of columns while reading in data
214
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892
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1
answers
How would && operators increase efficiency?
260
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906
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2
answers
Viewing Prep Quiz answers
251
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909
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1
answers
Viewing of the Solutions to the InClass Gradable
231
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913
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5
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Computer Error on the First Prep Quiz
234
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1018
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1
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Cross Validation Optimal Parameter Consistency
224
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1018
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2
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Cross Validation & Wilcoxon Solutions
289
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1024
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1
answers
Exam length
313
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1024
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1
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Logistic Regression Log Lambda / Coefficients Graph Explanation
267
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1025
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1
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Explain node impurity further
244
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1027
days
2
answers
Requesting a summary of results from Stock Prediction final submission
286
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1029
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1
answers
Summarizing CrossValidation Performance Values
256
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1029
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1
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AUC ROC calculation explored
276
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1029
days
1
answers
Comprising a 5x2cfv
241
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1031
days
1
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Should I subtract colMeans from my DTM matrix when I am recreating it in the predict function?
239
views
1031
days
1
answers
Splitting a Table Without Hardcoding
248
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1031
days
2
answers
New data passed with ensemble of models?
282
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1031
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2
answers
DATA_GRADING data from 2002 missing
250
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1031
days
2
answers
How to combine multiple models for final submission
244
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1031
days
1
answers
Matching symbols with predictions in the predict function
293
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1031
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1
answers
Passing variables between functions
246
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1031
days
1
answers
When to install.packages for grader
226
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1032
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1
answers
columns.txt file in Data Grading folder
228
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1032
days
1
answers
MERGE() command Techniques
255
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1032
days
3
answers
Reading in new data
217
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1034
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1
answers
Wilcoxon signedranks test: Value of parameter "p" in the critical values table
248
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1034
days
1
answers
what does it mean  return indicators
220
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1035
days
1
answers
Wilcoxon assingment
210
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1035
days
1
answers
Deploying the model given by the calibrate function on unbinned or binned data?
248
views
1035
days
1
answers
Clarification on Final Code Deliverable
214
views
1035
days
1
answers
graphing function takes labels as argument
245
views
1035
days
1
answers
What do we do if our calibrated predictions are incorrect?
234
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1036
days
1
answers
Getting a better smoothed fit for plot
245
views
1036
days
1
answers
Number of bins for plotting Calibration and bin classifier scores
319
views
1037
days
1
answers
Output for 5x2fcv function?
335
views
1037
days
7
answers
predKNN Error: "Error in matrix(data = predKNN, ncol = k, nrow = nrow(testKNN)) : nonnumeric matrix extent"
238
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1037
days
1
answers
How do we structure a data frame for stacking models?
421
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1037
days
1
answers
WHAT DATA
266
views
1038
days
3
answers
Not enough memory to run RF on the Stocks data
508
views
1038
days
1
answers
Random Forest error on calibration function
265
views
1039
days
1
answers
How to select number of dates in test set
261
views
1039
days
1
answers
Choosing a good title
362
views
1039
days
1
answers
Text mining after SVD
259
views
1039
days
1
answers
Does the WilcoxonRanks Test function need to only work for 10 AUC scores at the .05 level?
306
views
1039
days
1
answers
Optimizing bins for calibration
235
views
1040
days
1
answers
What's the difference between Predictions and Predictions 2
255
views
1040
days
1
answers
Using Random Forest
240
views
1040
days
2
answers
The datasets.Rdata file location
266
views
1043
days
1
answers
Is it better to delete row of NA's or impute mode?
247
views
1043
days
1
answers
yTEST
245
views
1044
days
1
answers
Manually Evaluate Neural Network
224
views
1044
days
1
answers
NAs in Dataset from Lead Variable
280
views
1045
days
2
answers
How to execute R code inside a string variable?
293
views
1047
days
1
answers
Big Project Articles Text mining: Merging 2 data sets
265
views
1049
days
1
answers
Large assignment question about merging
229
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1050
days
1
answers
Inner merging DF with cardinality of manytomany
325
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1051
days
1
answers
RandomForest Prediction in Project
243
views
1051
days
1
answers
Round 3 Data
247
views
1051
days
1
answers
Round 4 Why are there so many unmatched Symbols?
240
views
1051
days
1
answers
Optimal Ensemble Size Exercise 2.8.6 for section 2.5.7
236
views
1052
days
1
answers
Defining Validation data vs training data
249
views
1052
days
3
answers
Tuning in Decision Trees
348
views
1052
days
6
answers
Error Received in Decision Tree
256
views
1052
days
1
answers
Using the mapping.csv file with Article Data
292
views
1052
days
1
answers
Bagged Trees Prediction
239
views
1054
days
1
answers
Neural Network Calculation: Entropy Term, etc.
247
views
1054
days
3
answers
Determining optimal number of trees  Exercise 2.8.6
260
views
1056
days
1
answers
Text mining: how to aggregate unstructured data in Large Assignment News Articles
258
views
1057
days
1
answers
submitting LR
501
views
1057
days
1
answers
Error from AUC function on KNN algorithm
395
views
1058
days
1
answers
GLM/GLMNET Multinomial/Binomial error
38618
views
1058
days
1
answers
Getting an error when running KNN algorithm on Project
519
views
1059
days
10
answers
Error running LR with glmnet
275
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1059
days
1
answers
Difference between BasetableTRAIN, BasetableVAL, BasetableTEST, and BasetableTRAINbig
235
views
1061
days
1
answers
Loop with letters instead of numbers
245
views
1062
days
1
answers
Independent and dependent variables for predictions
291
views
1062
days
1
answers
Leading variable
242
views
1062
days
1
answers
How to manually calculate AUC?
271
views
1062
days
1
answers
Why use AUC?
272
views
1062
days
1
answers
Dependent Variable
522
views
1063
days
1
answers
How to manually compute KNN
253
views
1064
days
1
answers
Discriminating between neighbors in Knearest neighbors where distance measures are equal
242
views
1065
days
1
answers
Computing Probabilities manually with Bayes Theorem.
312
views
1065
days
1
answers
KNearest Neighbors "for loop"
264
views
1065
days
1
answers
Using NaiveBayes() function that does not have the right criteria
257
views
1065
days
2
answers
HW#3 Question 1: Medium Tenure, High Spend
300
views
1065
days
1
answers
kNN Calculated Proportions
284
views
1066
days
1
answers
What is meant by "Estimation phase: Create a big ensemble with many trees only once"
312
views
1066
days
3
answers
Max AUC (bagged trees)
327
views
1066
days
4
answers
Create a bagged tree and tune the ensemble size
397
views
1066
days
7
answers
Euclidean Distance for KNearest Neighbors
289
views
1066
days
1
answers
taking Y of the nearest neighbors
259
views
1066
days
1
answers
Finding the Optimal # of Trees
260
views
1066
days
1
answers
Second intermediate deliverable: predictions
317
views
1067
days
2
answers
2.8.4 Exercises for Subsection 2.5.5
244
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1070
days
1
answers
Predicting Probabilities of New (X,Y) Using Naive Bayes
297
views
1078
days
2
answers
Threading in R
289
views
1078
days
2
answers
AUC
299
views
1078
days
3
answers
Predicting Using Naive Bayes
322
views
1078
days
1
answers
Lead variable for predictions
266
views
1078
days
2
answers
Sorting by stock symbol
281
views
1079
days
5
answers
Reading .csv files as Dataframe
258
views
1080
days
3
answers
Coaching Marketplace
663
views
1080
days
6
answers
Not Enough Distinct Predictions to compute area under ROC.
272
views
1080
days
1
answers
What to do if a rm command was used when it shouldn't have been?
287
views
1080
days
1
answers
Question sapply about
269
views
1081
days
1
answers
kNN.index vs. knn
254
views
1081
days
1
answers
kNN in class dependent variable
302
views
1081
days
1
answers
Coaching Marketplace: Can coaches meet with different teams?
252
views
1081
days
1
answers
First Prediction Wednesday Model
346
views
1085
days
1
answers
Meaning of negative AUC (in Round 1 results)
309
views
1085
days
1
answers
How do we write the predict function to give predictions for specific stocks?
270
views
1085
days
1
answers
How to use validation method on two separate data sets (test data= jan2nd & train data=prev.yr data+jan1st data)
308
views
1086
days
3
answers
HW#2: Calculating Second Half of SUBS dataset
431
views
1087
days
3
answers
Question about the NYSE dataset for Large Assignment  heavily skewed dependent variable
305
views
1087
days
1
answers
Large Assignment: Input / Output and function deliverables
322
views
1087
days
1
answers
Prediction Algorithm Output and what it means: If all my predNB values are under 0.50, is it ever guessing "YES?"
349
views
1088
days
1
answers
How to use your newly computed v and d to calculate u on the second half of the data?
331
views
1088
days
1
answers
Output of the KNN algorithm question > Prediction or probability
332
views
1089
days
3
answers
Warning in install.packages : package â€˜imputeâ€™ is not available (for R version 3.2.3)
297
views
1089
days
1
answers
What is the purpose of svd?
561
views
1090
days
3
answers
R error: infinite or missing values in 'x' when running svd(subs_mat)
277
views
1092
days
1
answers
Breaking a "tie" for Knearest neighbors
275
views
1092
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?
309
views
1092
days
1
answers
How to manually compute proportions of 1s using k nearest neighbors in R?
243
views
1093
days
1
answers
What is the significance of document vector weighting?
295
views
1094
days
1
answers
What is the response variable for the Group Stock Price Project?
477
views
1112
days
1
answers
Large Graded Partner Assignment Question
315
views
1114
days
1
answers
Can you please clarify what you are asking for when you want predictors from 5 columns?
261
views
1115
days
1
answers
Homework due dates
265
views
1115
days
1
answers
How to combine two functions with differing outputs and equations?
339
views
1115
days
1
answers
How to compute a lag on a variable?
334
views
1115
days
1
answers
Best Way to Attempt Homework
323
views
1115
days
1
answers
did you mean to say flag or lag in the exercise?
265
views
1116
days
1
answers
What does putting "as." in front of numeric or factor accomplish?
332
views
1116
days
1
answers
What is the difference between characters, numerics, factors, and integers?
338
views
1116
days
1
answers
How to compute the time window in model deployment?
378
views
1119
days
4
answers
How to keep the same structure of a data frame when appying functions to it?
400
views
1119
days
1
answers
Can you clarify the following statement: Compute the the sum by both ID1 and ID2 ? HW1 Exercise4 (due 2/1)
637
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1120
days
4
answers
Error: undefined columns selected, when running dummy(x)