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

Hypothesis testing


Best consumed before six months from date of manufacture, Two years warranty, Expiry date: June 20, 2015, and so on, are some of the likely assurances, which readers would have easily come across. An analyst will have to arrive at such statements using the related data. Let us first define a hypothesis:

  • Hypothesis: A hypothesis is an assertion about the unknown parameter of the probability distribution. For the quote of this section, denoting the least time (in months) until which an eatery will not be losing its good taste by , the hypothesis of interest will be . It is common to denote the hypothesis of interest by and it is called the null hypothesis. We want to test the null hypothesis against the alternative hypothesis that the consumption time is well before six months' time, which in symbols is denoted by . We will begin with some important definitions followed by related examples.
  • Test statistic: A statistic that is a function of the random sample is called a...