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Questions: 170 | Resolved: 170 | Answers: 263 | Views : 76724 | Avg time to answer : 1.4 days




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128
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Support Vector Machines and figure 2.15




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Understanding classifier performance




106
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AUACC vs AUROC curves




128
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Features in Support Vector Machines




117
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ICA #19 Solution




118
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Something forgotten before an important dealine




120
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509
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Bagged Decision Tree vs. Random Forest




130
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511
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Do we need to train the model on train+test set again after finding optimal ensemble size?




126
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Figure 2.8 and equation 2.24




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Double colon?




124
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Good Predictions




118
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In binomial likelihood function why is number of trials equal to 1




123
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The difference between using predict() on BasetableVAL and BasetableTEST




118
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534
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Creating identical percentages of 1's and 0's efficiently




121
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535
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Naive Bayes: How can we tell when to tune data?




122
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538
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Viewing files before reading into R using notepad




120
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539
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combining rbind and lapply -- the reasoning behind not using them together




190
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542
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what do you mean when you use the word 'handling'?




130
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576
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Data Frame subsetted with logical types FALSE, TRUE




145
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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




152
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636
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When do we perform variable selection outside of regression?




177
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662
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"idf" function




191
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667
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Second Test Allowed Material Usage




214
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697
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Test Material Usage




195
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698
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Defining the classes of columns while reading in data




170
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705
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How would && operators increase efficiency?




213
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720
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Viewing Prep Quiz answers




203
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Viewing of the Solutions to the In-Class Gradable




183
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727
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Computer Error on the First Prep Quiz




192
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832
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Cross Validation Optimal Parameter Consistency




181
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832
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Cross Validation & Wilcoxon Solutions




244
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Exam length




256
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838
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Logistic Regression Log Lambda / Coefficients Graph Explanation




222
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839
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Explain node impurity further




200
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840
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Requesting a summary of results from Stock Prediction final submission




226
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843
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Summarizing Cross-Validation Performance Values




212
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843
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AUC ROC calculation explored




229
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843
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Comprising a 5x2cfv




199
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845
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Should I subtract colMeans from my DTM matrix when I am recreating it in the predict function?




195
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Splitting a Table Without Hardcoding




206
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New data passed with ensemble of models?




241
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DATA_GRADING data from 2002 missing




204
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How to combine multiple models for final submission




202
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Matching symbols with predictions in the predict function




247
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Passing variables between functions




200
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When to install.packages for grader




185
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columns.txt file in Data Grading folder




183
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846
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MERGE() command Techniques




210
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846
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Reading in new data




171
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848
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Wilcoxon signed-ranks test: Value of parameter "p" in the critical values table




207
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848
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what does it mean - return indicators




179
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Wilcoxon assingment




170
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Deploying the model given by the calibrate function on unbinned or binned data?




207
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Clarification on Final Code Deliverable




176
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graphing function takes labels as argument




207
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What do we do if our calibrated predictions are incorrect?




196
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850
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Getting a better smoothed fit for plot




203
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850
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Number of bins for plotting Calibration and bin classifier scores




272
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851
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Output for 5x2fcv function?




276
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851
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predKNN Error: "Error in matrix(data = predKNN, ncol = k, nrow = nrow(testKNN)) : non-numeric matrix extent"




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851
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How do we structure a data frame for stacking models?




367
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WHAT DATA




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Not enough memory to run RF on the Stocks data




400
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852
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Random Forest error on calibration function




215
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853
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How to select number of dates in test set




221
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853
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Choosing a good title




305
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853
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Text mining after SVD




218
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853
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Does the Wilcoxon-Ranks Test function need to only work for 10 AUC scores at the .05 level?




253
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853
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Optimizing bins for calibration




193
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854
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What's the difference between Predictions and Predictions 2




218
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854
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Using Random Forest




200
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854
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The datasets.Rdata file location




227
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857
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Is it better to delete row of NA's or impute mode?




206
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857
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yTEST




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857
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Manually Evaluate Neural Network




185
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858
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NAs in Dataset from Lead Variable




234
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859
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How to execute R code inside a string variable?




247
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861
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Big Project Articles Text mining: Merging 2 data sets




217
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863
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Large assignment question about merging




189
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864
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Inner merging DF with cardinality of many-to-many




274
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RandomForest Prediction in Project




201
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Round 3 Data




209
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Round 4 Why are there so many unmatched Symbols?




199
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Optimal Ensemble Size Exercise 2.8.6 for section 2.5.7




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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




213
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866
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Using the mapping.csv file with Article Data




246
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Bagged Trees Prediction




197
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868
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Neural Network Calculation: Entropy Term, etc.




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Determining optimal number of trees - Exercise 2.8.6




220
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870
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Text mining: how to aggregate unstructured data in Large Assignment News Articles




218
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871
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submitting LR




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Error from AUC function on KNN algorithm




256
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GLM/GLMNET Multinomial/Binomial error




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Getting an error when running KNN algorithm on Project




372
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Error running LR with glmnet




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Difference between BasetableTRAIN, BasetableVAL, BasetableTEST, and BasetableTRAINbig




195
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875
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Loop with letters instead of numbers




204
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876
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Independent and dependent variables for predictions




247
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876
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Leading variable




201
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How to manually calculate AUC?




229
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Why use AUC?




224
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Dependent Variable




260
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877
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How to manually compute KNN




208
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877
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Discriminating between neighbors in K-nearest neighbors where distance measures are equal




203
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879
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Computing Probabilities manually with Bayes Theorem.




261
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879
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K-Nearest Neighbors "for loop"




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879
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Using NaiveBayes() function that does not have the right criteria




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HW#3 Question 1: Medium Tenure, High Spend




257
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kNN Calculated Proportions




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




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879
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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




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Threading in R




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AUC




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Predicting Using Naive Bayes




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Lead variable for predictions




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Sorting by stock symbol




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893
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Reading .csv files as Dataframe




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894
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Coaching Marketplace




506
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894
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Not Enough Distinct Predictions to compute area under ROC.




227
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894
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What to do if a rm command was used when it shouldn't have been?




235
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894
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Question sapply about




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894
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kNN.index vs. knn




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kNN in class dependent variable




247
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Coaching Marketplace: Can coaches meet with different teams?




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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?




228
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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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901
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Question about the NYSE dataset for Large Assignment - heavily skewed dependent variable




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901
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Large Assignment: Input / Output and function deliverables




273
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901
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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?"




303
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902
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How to use your newly computed v and d to calculate u on the second half of the data?




284
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902
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Output of the KNN algorithm question -> Prediction or probability




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903
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Warning in install.packages : package ‘impute’ is not available (for R version 3.2.3)




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903
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What is the purpose of svd?




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




239
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906
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Breaking a "tie" for K-nearest neighbors




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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?




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906
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How to manually compute proportions of 1s using k nearest neighbors in R?




204
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907
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What is the significance of document vector weighting?




252
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908
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What is the response variable for the Group Stock Price Project?




415
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926
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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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929
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How to combine two functions with differing outputs and equations?




287
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How to compute a lag on a variable?




278
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Best Way to Attempt Homework




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929
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did you mean to say flag or lag in the exercise?




227
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What does putting "as." in front of numeric or factor accomplish?




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




294
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930
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How to compute the time window in model deployment?




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933
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How to keep the same structure of a data frame when appying functions to it?




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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)