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Questions: 170 | Resolved: 170 | Answers: 263 | Views : 86474 | Avg time to answer : 8.1 days




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182
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Support Vector Machines and figure 2.15




154
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Understanding classifier performance




145
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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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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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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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Figure 2.8 and equation 2.24




163
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Double colon?




168
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Good Predictions




166
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717
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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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The difference between using predict() on BasetableVAL and BasetableTEST




161
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720
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Creating identical percentages of 1's and 0's efficiently




165
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722
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Naive Bayes: How can we tell when to tune data?




162
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725
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Viewing files before reading into R using notepad




160
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725
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combining rbind and lapply -- the reasoning behind not using them together




233
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728
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what do you mean when you use the word 'handling'?




178
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762
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Data Frame subsetted with logical types FALSE, TRUE




187
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806
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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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When do we perform variable selection outside of regression?




224
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849
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"idf" function




241
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854
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Second Test Allowed Material Usage




265
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883
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Test Material Usage




249
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884
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Defining the classes of columns while reading in data




214
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892
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How would && operators increase efficiency?




260
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906
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Viewing Prep Quiz answers




251
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909
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Viewing of the Solutions to the In-Class Gradable




231
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913
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Computer Error on the First Prep Quiz




234
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1018
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Cross Validation Optimal Parameter Consistency




224
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1018
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Cross Validation & Wilcoxon Solutions




289
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1024
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Exam length




313
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1024
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Logistic Regression Log Lambda / Coefficients Graph Explanation




267
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1025
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Explain node impurity further




244
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1027
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Requesting a summary of results from Stock Prediction final submission




286
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1029
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Summarizing Cross-Validation Performance Values




256
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1029
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AUC ROC calculation explored




276
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1029
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Comprising a 5x2cfv




241
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1031
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Should I subtract colMeans from my DTM matrix when I am recreating it in the predict function?




239
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1031
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Splitting a Table Without Hardcoding




248
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1031
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New data passed with ensemble of models?




282
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1031
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DATA_GRADING data from 2002 missing




250
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1031
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How to combine multiple models for final submission




244
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1031
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Matching symbols with predictions in the predict function




293
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1031
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Passing variables between functions




246
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1031
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When to install.packages for grader




226
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1032
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columns.txt file in Data Grading folder




228
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1032
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MERGE() command Techniques




255
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1032
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Reading in new data




217
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1034
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Wilcoxon signed-ranks test: Value of parameter "p" in the critical values table




248
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1034
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what does it mean - return indicators




220
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1035
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Wilcoxon assingment




210
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1035
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Deploying the model given by the calibrate function on unbinned or binned data?




248
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1035
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Clarification on Final Code Deliverable




214
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1035
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graphing function takes labels as argument




245
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1035
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What do we do if our calibrated predictions are incorrect?




234
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1036
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Getting a better smoothed fit for plot




245
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1036
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Number of bins for plotting Calibration and bin classifier scores




319
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1037
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Output for 5x2fcv function?




335
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1037
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predKNN Error: "Error in matrix(data = predKNN, ncol = k, nrow = nrow(testKNN)) : non-numeric matrix extent"




238
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1037
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How do we structure a data frame for stacking models?




421
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1037
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WHAT DATA




266
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1038
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Not enough memory to run RF on the Stocks data




508
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1038
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Random Forest error on calibration function




265
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1039
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How to select number of dates in test set




261
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1039
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Choosing a good title




362
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1039
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Text mining after SVD




259
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1039
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1
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Does the Wilcoxon-Ranks Test function need to only work for 10 AUC scores at the .05 level?




306
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1039
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Optimizing bins for calibration




235
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1040
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What's the difference between Predictions and Predictions 2




255
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1040
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Using Random Forest




240
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1040
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The datasets.Rdata file location




266
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1043
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Is it better to delete row of NA's or impute mode?




247
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1043
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yTEST




245
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1044
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Manually Evaluate Neural Network




224
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1044
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NAs in Dataset from Lead Variable




280
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1045
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How to execute R code inside a string variable?




293
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1047
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Big Project Articles Text mining: Merging 2 data sets




265
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1049
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Large assignment question about merging




229
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1050
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Inner merging DF with cardinality of many-to-many




325
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1051
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RandomForest Prediction in Project




243
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1051
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Round 3 Data




247
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1051
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Round 4 Why are there so many unmatched Symbols?




240
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1051
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Optimal Ensemble Size Exercise 2.8.6 for section 2.5.7




236
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Defining Validation data vs training data




249
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Tuning in Decision Trees




348
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1052
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Error Received in Decision Tree




256
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1052
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Using the mapping.csv file with Article Data




292
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1052
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Bagged Trees Prediction




239
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1054
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Neural Network Calculation: Entropy Term, etc.




247
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1054
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Determining optimal number of trees - Exercise 2.8.6




260
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1056
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Text mining: how to aggregate unstructured data in Large Assignment News Articles




258
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1057
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submitting LR




501
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Error from AUC function on KNN algorithm




395
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1058
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GLM/GLMNET Multinomial/Binomial error




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Getting an error when running KNN algorithm on Project




519
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Error running LR with glmnet




275
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1059
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Difference between BasetableTRAIN, BasetableVAL, BasetableTEST, and BasetableTRAINbig




235
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1061
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Loop with letters instead of numbers




245
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1062
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Independent and dependent variables for predictions




291
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1062
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Leading variable




242
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1062
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How to manually calculate AUC?




271
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1062
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Why use AUC?




272
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1062
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Dependent Variable




522
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1063
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How to manually compute KNN




253
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1064
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Discriminating between neighbors in K-nearest neighbors where distance measures are equal




242
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1065
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1
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Computing Probabilities manually with Bayes Theorem.




312
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1065
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K-Nearest Neighbors "for loop"




264
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1065
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Using NaiveBayes() function that does not have the right criteria




257
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1065
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HW#3 Question 1: Medium Tenure, High Spend




300
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1065
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kNN Calculated Proportions




284
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1066
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What is meant by "Estimation phase: Create a big ensemble with many trees only once"




312
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1066
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Max AUC (bagged trees)




327
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1066
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Create a bagged tree and tune the ensemble size




397
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Euclidean Distance for K-Nearest Neighbors




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1066
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taking Y of the nearest neighbors




259
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Finding the Optimal # of Trees




260
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Second intermediate deliverable: predictions




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1067
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2.8.4 Exercises for Subsection 2.5.5




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1070
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Predicting Probabilities of New (X,Y) Using Naive Bayes




297
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1078
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Threading in R




289
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1078
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AUC




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Predicting Using Naive Bayes




322
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1078
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Lead variable for predictions




266
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1078
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Sorting by stock symbol




281
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1079
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Reading .csv files as Dataframe




258
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1080
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Coaching Marketplace




663
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1080
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6
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Not Enough Distinct Predictions to compute area under ROC.




272
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1080
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What to do if a rm command was used when it shouldn't have been?




287
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1080
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Question sapply about




269
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1081
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kNN.index vs. knn




254
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1081
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kNN in class dependent variable




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Coaching Marketplace: Can coaches meet with different teams?




252
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1081
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First Prediction Wednesday Model




346
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1085
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Meaning of negative AUC (in Round 1 results)




309
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1085
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How do we write the predict function to give predictions for specific stocks?




270
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1085
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How to use validation method on two separate data sets (test data= jan2nd & train data=prev.yr data+jan1st data)




308
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1086
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HW#2: Calculating Second Half of SUBS dataset




431
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1087
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Question about the NYSE dataset for Large Assignment - heavily skewed dependent variable




305
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1087
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Large Assignment: Input / Output and function deliverables




322
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1087
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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?"




349
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1088
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1
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How to use your newly computed v and d to calculate u on the second half of the data?




331
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1088
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1
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Output of the KNN algorithm question -> Prediction or probability




332
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1089
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3
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Warning in install.packages : package ‘impute’ is not available (for R version 3.2.3)




297
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1089
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What is the purpose of svd?




561
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1090
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R error: infinite or missing values in 'x' when running svd(subs_mat)




277
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1092
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Breaking a "tie" for K-nearest neighbors




275
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1092
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Why do we sometimes use the transpose function back to back, and how do we recognize when it is appropriate to do so?




309
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1092
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How to manually compute proportions of 1s using k nearest neighbors in R?




243
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1093
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What is the significance of document vector weighting?




295
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1094
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What is the response variable for the Group Stock Price Project?




477
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1112
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Large Graded Partner Assignment Question




315
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1114
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Can you please clarify what you are asking for when you want predictors from 5 columns?




261
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1115
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Homework due dates




265
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1115
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How to combine two functions with differing outputs and equations?




339
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1115
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How to compute a lag on a variable?




334
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1115
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Best Way to Attempt Homework




323
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1115
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did you mean to say flag or lag in the exercise?




265
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1116
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What does putting "as." in front of numeric or factor accomplish?




332
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1116
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What is the difference between characters, numerics, factors, and integers?




338
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1116
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How to compute the time window in model deployment?




378
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1119
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4
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How to keep the same structure of a data frame when appying functions to it?




400
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1119
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Can you clarify the following statement: Compute the the sum by both ID1 and ID2 ? -HW1 Exercise4 (due 2/1)-




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