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Questions: 164

Resolved: 164

Answers: 255

Views : 30558

Avg time to answer : 1.2 days
463
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753
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4
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Error: undefined columns selected, when running dummy(x)
437
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713
days
6
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Not Enough Distinct Predictions to compute area under ROC.
362
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745
days
1
answers
Large Graded Partner Assignment Question
314
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671
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1
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WHAT DATA
312
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721
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3
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Question about the NYSE dataset for Large Assignment  heavily skewed dependent variable
304
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753
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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)
284
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699
days
7
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Euclidean Distance for KNearest Neighbors
269
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692
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10
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Error running LR with glmnet
269
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753
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4
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How to keep the same structure of a data frame when appying functions to it?
267
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724
days
3
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R error: infinite or missing values in 'x' when running svd(subs_mat)
264
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672
days
1
answers
Random Forest error on calibration function
255
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718
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1
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Meaning of negative AUC (in Round 1 results)
253
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750
days
1
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How to compute the time window in model deployment?
253
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722
days
1
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How to use your newly computed v and d to calculate u on the second half of the data?
244
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722
days
1
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Output of the KNN algorithm question > Prediction or probability
244
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748
days
1
answers
How to compute a lag on a variable?
242
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691
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1
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Error from AUC function on KNN algorithm
235
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670
days
1
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Output for 5x2fcv function?
234
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723
days
3
answers
Warning in install.packages : package â€˜imputeâ€™ is not available (for R version 3.2.3)
233
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749
days
1
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did you mean to say flag or lag in the exercise?
229
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748
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1
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Best Way to Attempt Homework
228
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700
days
2
answers
2.8.4 Exercises for Subsection 2.5.5
226
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699
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4
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Create a bagged tree and tune the ensemble size
225
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672
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1
answers
Text mining after SVD
222
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712
days
1
answers
Lead variable for predictions
222
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698
days
1
answers
KNearest Neighbors "for loop"
221
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721
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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?"
220
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719
days
1
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How do we write the predict function to give predictions for specific stocks?
220
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726
days
1
answers
How to manually compute proportions of 1s using k nearest neighbors in R?
218
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748
days
1
answers
Can you please clarify what you are asking for when you want predictors from 5 columns?
218
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699
days
3
answers
Max AUC (bagged trees)
217
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699
days
1
answers
kNN Calculated Proportions
215
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719
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3
answers
HW#2: Calculating Second Half of SUBS dataset
214
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749
days
1
answers
What is the difference between characters, numerics, factors, and integers?
212
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727
days
1
answers
What is the response variable for the Group Stock Price Project?
209
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657
days
1
answers
Logistic Regression Log Lambda / Coefficients Graph Explanation
208
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680
days
1
answers
Big Project Articles Text mining: Merging 2 data sets
207
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657
days
1
answers
Exam length
207
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721
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1
answers
Large Assignment: Input / Output and function deliverables
206
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673
days
1
answers
Optimizing bins for calibration
205
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699
days
1
answers
taking Y of the nearest neighbors
203
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714
days
1
answers
Coaching Marketplace: Can coaches meet with different teams?
203
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712
days
3
answers
Predicting Using Naive Bayes
203
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665
days
1
answers
Passing variables between functions
202
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712
days
2
answers
Threading in R
202
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686
days
1
answers
Bagged Trees Prediction
202
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723
days
1
answers
What is the purpose of svd?
202
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670
days
7
answers
predKNN Error: "Error in matrix(data = predKNN, ncol = k, nrow = nrow(testKNN)) : nonnumeric matrix extent"
202
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665
days
2
answers
DATA_GRADING data from 2002 missing
202
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685
days
6
answers
Error Received in Decision Tree
201
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713
days
5
answers
Reading .csv files as Dataframe
201
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691
days
1
answers
GLM/GLMNET Multinomial/Binomial error
199
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699
days
1
answers
What is meant by "Estimation phase: Create a big ensemble with many trees only once"
198
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684
days
1
answers
RandomForest Prediction in Project
197
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696
days
1
answers
Leading variable
197
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726
days
1
answers
Breaking a "tie" for Knearest neighbors
197
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692
days
1
answers
Difference between BasetableTRAIN, BasetableVAL, BasetableTEST, and BasetableTRAINbig
196
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712
days
2
answers
AUC
196
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697
days
1
answers
How to manually compute KNN
192
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714
days
1
answers
kNN.index vs. knn
191
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719
days
1
answers
How to use validation method on two separate data sets (test data= jan2nd & train data=prev.yr data+jan1st data)
188
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712
days
2
answers
Sorting by stock symbol
188
views
749
days
1
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What does putting "as." in front of numeric or factor accomplish?
188
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679
days
2
answers
How to execute R code inside a string variable?
186
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698
days
1
answers
Using NaiveBayes() function that does not have the right criteria
185
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663
days
1
answers
Comprising a 5x2cfv
185
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677
days
1
answers
Is it better to delete row of NA's or impute mode?
184
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713
days
3
answers
Coaching Marketplace
184
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691
days
1
answers
Getting an error when running KNN algorithm on Project
183
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748
days
1
answers
Homework due dates
183
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696
days
1
answers
Why use AUC?
183
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726
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?
183
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699
days
1
answers
Finding the Optimal # of Trees
183
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714
days
1
answers
Question sapply about
182
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673
days
1
answers
Does the WilcoxonRanks Test function need to only work for 10 AUC scores at the .05 level?
182
views
662
days
1
answers
Summarizing CrossValidation Performance Values
182
views
671
days
3
answers
Not enough memory to run RF on the Stocks data
181
views
714
days
1
answers
What to do if a rm command was used when it shouldn't have been?
181
views
672
days
1
answers
Choosing a good title
180
views
748
days
1
answers
How to combine two functions with differing outputs and equations?
180
views
674
days
1
answers
Using Random Forest
180
views
691
days
1
answers
submitting LR
180
views
700
days
1
answers
Second intermediate deliverable: predictions
179
views
714
days
1
answers
kNN in class dependent variable
179
views
658
days
1
answers
Explain node impurity further
178
views
714
days
1
answers
First Prediction Wednesday Model
178
views
696
days
1
answers
Dependent Variable
176
views
689
days
1
answers
Text mining: how to aggregate unstructured data in Large Assignment News Articles
176
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685
days
3
answers
Tuning in Decision Trees
175
views
672
days
1
answers
How to select number of dates in test set
174
views
666
days
3
answers
Reading in new data
174
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668
days
1
answers
Clarification on Final Code Deliverable
172
views
683
days
1
answers
Large assignment question about merging
172
views
685
days
1
answers
Round 4 Why are there so many unmatched Symbols?
172
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668
days
1
answers
what does it mean  return indicators
172
views
697
days
1
answers
Discriminating between neighbors in Knearest neighbors where distance measures are equal
172
views
677
days
1
answers
yTEST
171
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665
days
2
answers
How to combine multiple models for final submission
171
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699
days
2
answers
HW#3 Question 1: Medium Tenure, High Spend
170
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687
days
3
answers
Determining optimal number of trees  Exercise 2.8.6
170
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540
days
2
answers
Viewing Prep Quiz answers
170
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685
days
1
answers
Using the mapping.csv file with Article Data
170
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669
days
1
answers
What do we do if our calibrated predictions are incorrect?
169
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696
days
1
answers
Independent and dependent variables for predictions
169
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665
days
2
answers
New data passed with ensemble of models?
168
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684
days
1
answers
Round 3 Data
168
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665
days
1
answers
Matching symbols with predictions in the predict function
168
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517
days
1
answers
Test Material Usage
166
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670
days
1
answers
Number of bins for plotting Calibration and bin classifier scores
166
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664
days
1
answers
Should I subtract colMeans from my DTM matrix when I am recreating it in the predict function?
166
views
685
days
1
answers
Optimal Ensemble Size Exercise 2.8.6 for section 2.5.7
166
views
698
days
1
answers
Computing Probabilities manually with Bayes Theorem.
165
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663
days
1
answers
AUC ROC calculation explored
165
views
671
days
1
answers
How do we structure a data frame for stacking models?
165
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703
days
1
answers
Predicting Probabilities of New (X,Y) Using Naive Bayes
165
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665
days
1
answers
When to install.packages for grader
164
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687
days
1
answers
Neural Network Calculation: Entropy Term, etc.
164
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664
days
1
answers
Splitting a Table Without Hardcoding
164
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727
days
1
answers
What is the significance of document vector weighting?
164
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660
days
2
answers
Requesting a summary of results from Stock Prediction final submission
163
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669
days
1
answers
Getting a better smoothed fit for plot
162
views
674
days
2
answers
The datasets.Rdata file location
161
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696
days
1
answers
How to manually calculate AUC?
161
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673
days
1
answers
What's the difference between Predictions and Predictions 2
159
views
685
days
1
answers
Defining Validation data vs training data
159
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695
days
1
answers
Loop with letters instead of numbers
158
views
677
days
1
answers
Manually Evaluate Neural Network
157
views
542
days
1
answers
Viewing of the Solutions to the InClass Gradable
157
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652
days
1
answers
Cross Validation Optimal Parameter Consistency
154
views
684
days
1
answers
Inner merging DF with cardinality of manytomany
153
views
518
days
1
answers
Defining the classes of columns while reading in data
150
views
677
days
1
answers
NAs in Dataset from Lead Variable
149
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665
days
1
answers
columns.txt file in Data Grading folder
149
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487
days
1
answers
Second Test Allowed Material Usage
148
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666
days
1
answers
MERGE() command Techniques
147
views
652
days
2
answers
Cross Validation & Wilcoxon Solutions
146
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547
days
5
answers
Computer Error on the First Prep Quiz
144
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668
days
1
answers
Wilcoxon assingment
142
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669
days
1
answers
graphing function takes labels as argument
138
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668
days
1
answers
Deploying the model given by the calibrate function on unbinned or binned data?
136
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668
days
1
answers
Wilcoxon signedranks test: Value of parameter "p" in the critical values table
136
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482
days
1
answers
"idf" function
135
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525
days
1
answers
How would && operators increase efficiency?
116
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456
days
1
answers
When do we perform variable selection outside of regression?
111
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439
days
1
answers
How select the sequence parameter to use in a loop while trying to determine the optimal K for a KNN model
96
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362
days
1
answers
what do you mean when you use the word 'handling'?
96
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331
days
3
answers
Do we need to train the model on train+test set again after finding optimal ensemble size?
94
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396
days
1
answers
Data Frame subsetted with logical types FALSE, TRUE
91
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349
days
1
answers
Figure 2.8 and equation 2.24
90
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349
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2
answers
Good Predictions
88
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316
days
1
answers
Features in Support Vector Machines
88
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329
days
1
answers
Bagged Decision Tree vs. Random Forest
88
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289
days
1
answers
Support Vector Machines and figure 2.15
87
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355
days
3
answers
Naive Bayes: How can we tell when to tune data?
87
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359
days
1
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combining rbind and lapply  the reasoning behind not using them together
85
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351
days
1
answers
The difference between using predict() on BasetableVAL and BasetableTEST
84
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358
days
1
answers
Viewing files before reading into R using notepad
83
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320
days
2
answers
ICA #19 Solution
83
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324
days
1
answers
Something forgotten before an important dealine
83
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349
days
1
answers
Double colon?
83
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351
days
2
answers
In binomial likelihood function why is number of trials equal to 1
83
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354
days
1
answers
Creating identical percentages of 1's and 0's efficiently
79
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302
days
1
answers
Understanding classifier performance
73
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310
days
1
answers
AUACC vs AUROC curves