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Questions: 170 | Resolved: 170 | Answers: 263 | Views : 83948 | Avg time to answer : 5.6 days




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160
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Support Vector Machines and figure 2.15




144
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Understanding classifier performance




135
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AUACC vs AUROC curves




161
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611
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Features in Support Vector Machines




148
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ICA #19 Solution




146
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Something forgotten before an important dealine




154
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624
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Bagged Decision Tree vs. Random Forest




163
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626
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Do we need to train the model on train+test set again after finding optimal ensemble size?




157
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644
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Figure 2.8 and equation 2.24




152
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Double colon?




159
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Good Predictions




154
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646
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In binomial likelihood function why is number of trials equal to 1




153
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646
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The difference between using predict() on BasetableVAL and BasetableTEST




149
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649
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Creating identical percentages of 1's and 0's efficiently




155
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650
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Naive Bayes: How can we tell when to tune data?




150
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653
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Viewing files before reading into R using notepad




148
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654
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combining rbind and lapply -- the reasoning behind not using them together




222
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657
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what do you mean when you use the word 'handling'?




164
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691
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Data Frame subsetted with logical types FALSE, TRUE




176
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734
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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




182
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751
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When do we perform variable selection outside of regression?




210
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777
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"idf" function




226
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782
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Second Test Allowed Material Usage




250
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812
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Test Material Usage




234
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813
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Defining the classes of columns while reading in data




202
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820
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How would && operators increase efficiency?




245
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Viewing Prep Quiz answers




235
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837
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Viewing of the Solutions to the In-Class Gradable




212
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842
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Computer Error on the First Prep Quiz




222
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947
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Cross Validation Optimal Parameter Consistency




211
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Cross Validation & Wilcoxon Solutions




276
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952
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Exam length




293
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952
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Logistic Regression Log Lambda / Coefficients Graph Explanation




254
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953
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Explain node impurity further




229
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955
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Requesting a summary of results from Stock Prediction final submission




271
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957
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Summarizing Cross-Validation Performance Values




244
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958
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AUC ROC calculation explored




262
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958
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Comprising a 5x2cfv




230
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959
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Should I subtract colMeans from my DTM matrix when I am recreating it in the predict function?




226
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959
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Splitting a Table Without Hardcoding




236
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960
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New data passed with ensemble of models?




272
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960
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DATA_GRADING data from 2002 missing




236
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960
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How to combine multiple models for final submission




232
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Matching symbols with predictions in the predict function




279
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960
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Passing variables between functions




231
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960
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When to install.packages for grader




213
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960
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columns.txt file in Data Grading folder




215
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961
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MERGE() command Techniques




241
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961
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Reading in new data




205
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963
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Wilcoxon signed-ranks test: Value of parameter "p" in the critical values table




237
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963
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what does it mean - return indicators




206
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963
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Wilcoxon assingment




198
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963
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Deploying the model given by the calibrate function on unbinned or binned data?




234
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963
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Clarification on Final Code Deliverable




202
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964
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graphing function takes labels as argument




233
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What do we do if our calibrated predictions are incorrect?




222
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964
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Getting a better smoothed fit for plot




229
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965
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Number of bins for plotting Calibration and bin classifier scores




304
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Output for 5x2fcv function?




316
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predKNN Error: "Error in matrix(data = predKNN, ncol = k, nrow = nrow(testKNN)) : non-numeric matrix extent"




226
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How do we structure a data frame for stacking models?




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WHAT DATA




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Not enough memory to run RF on the Stocks data




476
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967
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Random Forest error on calibration function




251
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967
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How to select number of dates in test set




250
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967
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Choosing a good title




344
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967
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Text mining after SVD




246
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968
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Does the Wilcoxon-Ranks Test function need to only work for 10 AUC scores at the .05 level?




291
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968
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Optimizing bins for calibration




220
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968
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What's the difference between Predictions and Predictions 2




243
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969
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Using Random Forest




226
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969
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The datasets.Rdata file location




252
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972
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Is it better to delete row of NA's or impute mode?




233
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yTEST




229
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Manually Evaluate Neural Network




212
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NAs in Dataset from Lead Variable




264
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How to execute R code inside a string variable?




278
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975
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Big Project Articles Text mining: Merging 2 data sets




249
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978
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Large assignment question about merging




219
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Inner merging DF with cardinality of many-to-many




310
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RandomForest Prediction in Project




230
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Round 3 Data




235
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980
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Round 4 Why are there so many unmatched Symbols?




227
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980
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Optimal Ensemble Size Exercise 2.8.6 for section 2.5.7




219
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Defining Validation data vs training data




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Tuning in Decision Trees




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Error Received in Decision Tree




242
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Using the mapping.csv file with Article Data




277
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Bagged Trees Prediction




226
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Neural Network Calculation: Entropy Term, etc.




234
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Determining optimal number of trees - Exercise 2.8.6




247
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Text mining: how to aggregate unstructured data in Large Assignment News Articles




247
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submitting LR




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Error from AUC function on KNN algorithm




355
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GLM/GLMNET Multinomial/Binomial error




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Getting an error when running KNN algorithm on Project




487
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Error running LR with glmnet




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987
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Difference between BasetableTRAIN, BasetableVAL, BasetableTEST, and BasetableTRAINbig




222
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990
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Loop with letters instead of numbers




234
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991
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Independent and dependent variables for predictions




277
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991
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Leading variable




229
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991
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How to manually calculate AUC?




258
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Why use AUC?




253
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991
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Dependent Variable




507
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992
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How to manually compute KNN




240
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992
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Discriminating between neighbors in K-nearest neighbors where distance measures are equal




228
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993
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Computing Probabilities manually with Bayes Theorem.




297
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993
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K-Nearest Neighbors "for loop"




252
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Using NaiveBayes() function that does not have the right criteria




241
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994
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HW#3 Question 1: Medium Tenure, High Spend




287
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994
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kNN Calculated Proportions




270
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994
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What is meant by "Estimation phase: Create a big ensemble with many trees only once"




298
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994
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Max AUC (bagged trees)




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Create a bagged tree and tune the ensemble size




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Euclidean Distance for K-Nearest Neighbors




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taking Y of the nearest neighbors




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Finding the Optimal # of Trees




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Second intermediate deliverable: predictions




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2.8.4 Exercises for Subsection 2.5.5




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




279
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1007
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Threading in R




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1007
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AUC




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Predicting Using Naive Bayes




308
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1007
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Lead variable for predictions




255
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1007
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Sorting by stock symbol




267
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1008
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Reading .csv files as Dataframe




245
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1008
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Coaching Marketplace




610
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1008
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Not Enough Distinct Predictions to compute area under ROC.




258
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1009
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What to do if a rm command was used when it shouldn't have been?




267
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Question sapply about




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1009
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kNN.index vs. knn




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kNN in class dependent variable




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Coaching Marketplace: Can coaches meet with different teams?




241
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First Prediction Wednesday Model




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Meaning of negative AUC (in Round 1 results)




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




255
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How to use validation method on two separate data sets (test data= jan2nd & train data=prev.yr data+jan1st data)




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HW#2: Calculating Second Half of SUBS dataset




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1016
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Question about the NYSE dataset for Large Assignment - heavily skewed dependent variable




284
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1016
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Large Assignment: Input / Output and function deliverables




306
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1016
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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?"




336
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How to use your newly computed v and d to calculate u on the second half of the data?




319
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1017
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Output of the KNN algorithm question -> Prediction or probability




319
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1018
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Warning in install.packages : package ‘impute’ is not available (for R version 3.2.3)




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1018
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What is the purpose of svd?




533
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R error: infinite or missing values in 'x' when running svd(subs_mat)




267
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1021
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Breaking a "tie" for K-nearest neighbors




259
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1021
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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?




294
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1021
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How to manually compute proportions of 1s using k nearest neighbors in R?




230
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What is the significance of document vector weighting?




282
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1022
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What is the response variable for the Group Stock Price Project?




458
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Large Graded Partner Assignment Question




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




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Homework due dates




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How to combine two functions with differing outputs and equations?




325
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How to compute a lag on a variable?




317
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Best Way to Attempt Homework




310
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1044
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did you mean to say flag or lag in the exercise?




254
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What does putting "as." in front of numeric or factor accomplish?




313
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What is the difference between characters, numerics, factors, and integers?




328
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1045
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How to compute the time window in model deployment?




362
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1048
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How to keep the same structure of a data frame when appying functions to it?




386
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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)