Book Image

Statistical Application Development with R and Python - Second Edition

Book Image

Statistical Application Development with R and Python - Second Edition

Overview of this book

Statistical Analysis involves collecting and examining data to describe the nature of data that needs to be analyzed. It helps you explore the relation of data and build models to make better decisions. This book explores statistical concepts along with R and Python, which are well integrated from the word go. Almost every concept has an R code going with it which exemplifies the strength of R and applications. The R code and programs have been further strengthened with equivalent Python programs. Thus, you will first understand the data characteristics, descriptive statistics and the exploratory attitude, which will give you firm footing of data analysis. Statistical inference will complete the technical footing of statistical methods. Regression, linear, logistic modeling, and CART, builds the essential toolkit. This will help you complete complex problems in the real world. You will begin with a brief understanding of the nature of data and end with modern and advanced statistical models like CART. Every step is taken with DATA and R code, and further enhanced by Python. The data analysis journey begins with exploratory analysis, which is more than simple, descriptive, data summaries. You will then apply linear regression modeling, and end with logistic regression, CART, and spatial statistics. By the end of this book you will be able to apply your statistical learning in major domains at work or in your projects.
Table of Contents (19 chapters)
Statistical Application Development with R and Python - Second Edition
Credits
About the Author
Acknowledgment
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
Index

Essential summary statistics


We have seen useful summary statistics of mean and variance in the Discrete distributions and Continuous distributions sections of Chapter 1, Data Characteristics. The concepts therein have their own utility value. The drawback of such statistical metrics is that they are very sensitive to outliers, in the sense that a single observation may completely distort the entire story.

In this section, we will discuss some exploratory analysis metrics that are intuitive and more robust than the metrics such as mean and variance. We'll be learning the following metrics:

  • Percentiles

  • Quantiles

  • Median

  • Hinges

  • Interquartile range

Percentiles, quantiles, and median

For a given dataset and a number 0 < k < 1, the 100k% percentile divides the dataset into two partitions with 100k% of the values below it and 100(1-k)% of the values above it. The fraction k is referred as a quantile. In Statistics, quantiles are used more often than percentiles. The difference being that the quantiles...