This textbook on practical data analytics unites fundamental principles algorithms and data. Algorithms are the keystone of data analytics and the focal point of this textbook. Clear and intuitive explanations of the mathematical and statistical foundations make the algorithms transparent. But practical data analytics requires more than just the foundations. Problems and data are enormously variable and only the most elementary of algorithms can be used without modification. Programming fluency and experience with real and challenging data is indispensable and so the reader is immersed in Python and R and real data analysis. By the end of the book the reader will have gained the ability to adapt algorithms to new problems and carry out innovative analyses.This book has three partsa Data Reduction Begins with the concepts of data reduction data maps and information extraction. The second chapter introduces associative statistics the mathematical foundation of scalable algorithms and distributed computing. Practical aspects of distributed computing is the subject of the Hadoop and MapReduce chapter.b Extracting Information from Data Linear regression and data visualization are the principal topics of Part II. The authors dedicate a chapter to the critical domain of Healthcare Analytics for an extended example of practical data analytics. The algorithms and analytics will be of much interest to practitioners interested in utilizing the large and unwieldly data sets of the Centers for Disease Control and Preventions Behavioral Risk Factor Surveillance System.c Predictive Analytics Two foundational and widely used algorithms knearest neighbors and naive Bayes are developed in detail. A chapter is dedicated to forecasting. The last chapter focuses on streaming data and uses publicly accessible data streams originating from the API and the NASDAQ stock market in the tutorials.This book is intended for a one or twosemester course in data analytics for upperdivision undergr