Book Image

Python Data Analysis - Third Edition

By : Avinash Navlani, Ivan Idris
5 (1)
Book Image

Python Data Analysis - Third Edition

5 (1)
By: Avinash Navlani, Ivan Idris

Overview of this book

Data analysis enables you to generate value from small and big data by discovering new patterns and trends, and Python is one of the most popular tools for analyzing a wide variety of data. With this book, you’ll get up and running using Python for data analysis by exploring the different phases and methodologies used in data analysis and learning how to use modern libraries from the Python ecosystem to create efficient data pipelines. Starting with the essential statistical and data analysis fundamentals using Python, you’ll perform complex data analysis and modeling, data manipulation, data cleaning, and data visualization using easy-to-follow examples. You’ll then understand how to conduct time series analysis and signal processing using ARMA models. As you advance, you’ll get to grips with smart processing and data analytics using machine learning algorithms such as regression, classification, Principal Component Analysis (PCA), and clustering. In the concluding chapters, you’ll work on real-world examples to analyze textual and image data using natural language processing (NLP) and image analytics techniques, respectively. Finally, the book will demonstrate parallel computing using Dask. By the end of this data analysis book, you’ll be equipped with the skills you need to prepare data for analysis and create meaningful data visualizations for forecasting values from data.
Table of Contents (20 chapters)
Section 1: Foundation for Data Analysis
Section 2: Exploratory Data Analysis and Data Cleaning
Section 3: Deep Dive into Machine Learning
Section 4: NLP, Image Analytics, and Parallel Computing

Performing non-parametric tests

A non-parametric test doesn't rely on any statistical distribution; that is why it is known as a "distribution-free" hypothesis test. Non-parametric tests don't have parameters of the population. Such types of tests are used for order and rank of observations and require special ranking and counting methods. Here are some examples of non-parametric tests:

  • A Chi-Square test is determined by a significant difference or relationship between two categorical variables from a single population. In general, this test assesses whether distributions of categorical variables differ from each other. It is also known as a Chi-Square goodness of fit test or a Chi-Square test for independence. A small value of the Chi-Square statistic means observed data fit with expected data, and a larger value of the Chi-Square statistic means observed data doesn't fit with expected data. For example, the impact of gender on voting preference or the impact...