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Essential Statistics for Non-STEM Data Analysts

Essential Statistics for Non-STEM Data Analysts

By : Li
4.6 (10)
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Essential Statistics for Non-STEM Data Analysts

Essential Statistics for Non-STEM Data Analysts

4.6 (10)
By: Li

Overview of this book

Statistics remain the backbone of modern analysis tasks, helping you to interpret the results produced by data science pipelines. This book is a detailed guide covering the math and various statistical methods required for undertaking data science tasks. The book starts by showing you how to preprocess data and inspect distributions and correlations from a statistical perspective. You’ll then get to grips with the fundamentals of statistical analysis and apply its concepts to real-world datasets. As you advance, you’ll find out how statistical concepts emerge from different stages of data science pipelines, understand the summary of datasets in the language of statistics, and use it to build a solid foundation for robust data products such as explanatory models and predictive models. Once you’ve uncovered the working mechanism of data science algorithms, you’ll cover essential concepts for efficient data collection, cleaning, mining, visualization, and analysis. Finally, you’ll implement statistical methods in key machine learning tasks such as classification, regression, tree-based methods, and ensemble learning. By the end of this Essential Statistics for Non-STEM Data Analysts book, you’ll have learned how to build and present a self-contained, statistics-backed data product to meet your business goals.
Table of Contents (19 chapters)
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1
Section 1: Getting Started with Statistics for Data Science
5
Section 2: Essentials of Statistical Analysis
10
Section 3: Statistics for Machine Learning
15
Section 4: Appendix

Understanding the bootstrapping and bagging techniques

Bootstrapping is a pictorial word. It allows us to imagine someone pulling themselves up by their bootstraps. In other words, if no one is going to help us, then we need to help ourselves. In statistics, however, this is a sampling method. If there is not enough data, we help ourselves by creating more data.

Imagine that you have a small dataset and you want to build a classifier/estimator with this limited amount of data. In this case, you can perform cross-validation. Cross-validation techniques such as 10-fold cross-validation will decrease the number of records in each fold even further. We can take all the data as the training data, but you likely will end up with a model with very high variance. What should we do, then?

The bootstrapping method says that if the dataset being used is a sample of the unknown data in the dataset, why not try resampling again? The bootstrap method creates new training sets by uniformly...

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