Book Image

Python Data Analysis Cookbook

By : Ivan Idris
Book Image

Python Data Analysis Cookbook

By: Ivan Idris

Overview of this book

Data analysis is a rapidly evolving field and Python is a multi-paradigm programming language suitable for object-oriented application development and functional design patterns. As Python offers a range of tools and libraries for all purposes, it has slowly evolved as the primary language for data science, including topics on: data analysis, visualization, and machine learning. Python Data Analysis Cookbook focuses on reproducibility and creating production-ready systems. You will start with recipes that set the foundation for data analysis with libraries such as matplotlib, NumPy, and pandas. You will learn to create visualizations by choosing color maps and palettes then dive into statistical data analysis using distribution algorithms and correlations. You’ll then help you find your way around different data and numerical problems, get to grips with Spark and HDFS, and then set up migration scripts for web mining. In this book, you will dive deeper into recipes on spectral analysis, smoothing, and bootstrapping methods. Moving on, you will learn to rank stocks and check market efficiency, then work with metrics and clusters. You will achieve parallelism to improve system performance by using multiple threads and speeding up your code. By the end of the book, you will be capable of handling various data analysis techniques in Python and devising solutions for problem scenarios.
Table of Contents (23 chapters)
Python Data Analysis Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Glossary
Index

Determining confidence intervals for mean, variance, and standard deviation


It is sometimes useful to imagine that the data we observe is just the tip of an iceberg. If you get into this mindset, then you probably will want to know how big this iceberg actually is. Obviously, if you can't see the whole thing, you can still try to extrapolate from the data you have. In statistics we try to estimate confidence intervals, which are an estimated range usually associated with a certain confidence level quoted in percentages.

The scipy.stats.bayes_mvs() function estimates confidence intervals for mean, variance, and standard deviation. The function uses Bayesian statistics to estimate confidence assuming that the data is independent and normally distributed. Jackknifing is an alternative deterministic algorithm to estimate confidence intervals. It falls under the family of resampling algorithms. Usually, we generate new datasets under the jackknifing algorithm by deleting one value (we can also...