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About the Book

This book is for you if

• you've been building scorecards using SAS or SPSS and want to do the same thing in R, or
• you want a step-by-step guide to building and backtesting a binary classifier using logistic regression in R, or
• you want to learn how to automate the model selection process using the best subset mehtod, or
• you want to understand the differences amongst the 6 performance measures: Accuracy, Sensitivity, False Positive Rate, Specificity, Precision, and the F-measure, and when to use which.
• you want to learn how to make the ROC curve and calculate the Aear Under the Curve (AUC) in R.

This book is not for you if

• you're looking for thorough understanding of the relavent statistical theories. This is a how-to book, not a why book, though intuitive reasons are pointed out whenever possible.
• you need to see math formulas. All formulas are presented directly in the form of R code.
• you're looking for an introductory R book. This book doesn't explain how R works. 

About the Author

Guangming Lang

Guangming Lang is the founder and Chief Data Scientist at Cabaceo LLC. He also teaches people how to do data analysis using the R programming language at MasterR.org, where you can receive high quality training materials for free. He used to work for FICO. He has a masters degree in biostatistics from the University of Michigan and a bachelor's degree in mathematics from the New College of Florida.