Book Image

SQL for Data Analytics - Third Edition

By : Jun Shan, Matt Goldwasser, Upom Malik, Benjamin Johnston
Book Image

SQL for Data Analytics - Third Edition

By: Jun Shan, Matt Goldwasser, Upom Malik, Benjamin Johnston

Overview of this book

Every day, businesses operate around the clock, and a huge amount of data is generated at a rapid pace. This book helps you analyze this data and identify key patterns and behaviors that can help you and your business understand your customers at a deep, fundamental level. SQL for Data Analytics, Third Edition is a great way to get started with data analysis, showing how to effectively sort and process information from raw data, even without any prior experience. You will begin by learning how to form hypotheses and generate descriptive statistics that can provide key insights into your existing data. As you progress, you will learn how to write SQL queries to aggregate, calculate, and combine SQL data from sources outside of your current dataset. You will also discover how to work with advanced data types, like JSON. By exploring advanced techniques, such as geospatial analysis and text analysis, you will be able to understand your business at a deeper level. Finally, the book lets you in on the secret to getting information faster and more effectively by using advanced techniques like profiling and automation. By the end of this book, you will be proficient in the efficient application of SQL techniques in everyday business scenarios and looking at data with the critical eye of analytics professional.
Table of Contents (11 chapters)
9. Using SQL to Uncover the Truth: A Case Study

Types of Statistics

Statistics can be further divided into two subcategories: descriptive statistics and inferential statistics.

Descriptive statistics are used to describe a collection of data. For example, the average age of people in a country is a descriptive statistics indicator that describes an aspect of the country's residents. Descriptive statistics on a single variable in a dataset are called univariate analysis, while descriptive statistics that look at two or more variables at the same time are called multivariate analysis. In particular, statistics that look at two variables are called bivariate analysis. The average age of a country is an example of univariate analysis, while an analysis examining the interaction between GDP per capita, healthcare spending per capita, and age is multivariate analysis.

In contrast, inferential statistics allows datasets to be collected as a sample or a small portion of measurements from a larger group, called a population....