Probability and Statistics Essentials for Data Science and Machine Learning: 200+ examples and pictures

Updated 2026 EditionMost probability and statistics books stop short of the algorithms a working data scientist actually runs. Most machine learning books skip the math underneath.This book is the bridge.It builds probability and statistics from the ground up, then carries the same thread into the algorithms data scientists use every day, including Maximum Likelihood Estimation, Linear Regression, and Logistic Regression.What makes it different:Anchored in Real Business Problems: The book runs on real business problems (say, a LinkedIn marketing team optimizing engagement, or a product-page A/B test deciding whether a new layout is actually better). Concepts are introduced exactly when the problem needs them, not in abstract topic order, and every problem ends with a concrete business answer.Built From First Principles: Every concept is reasoned out from the ground up. The book first explains why a concept exists, what problem it solves, and where it fits, then introduces the notation. The reader follows the logic, not just the symbols.The Unbroken Thread: The book is built so each chapter compounds on the last. By the time you reach the machine learning chapters, you have already worked through the probability and statistics they run on.A Visual-First Approach: The book makes heavy use of figures. Concepts are designed to be seen, not just stated.Inside the book:Probability foundations: sample spaces, axioms, conditional probability, Bayes' theoremRandom variables and distributions: Bernoulli, Binomial, Poisson, Exponential, Log-normal, Beta, and the Normal distributionJoint, marginal, and conditional distributions, and the Law of Large NumbersDescriptive statistics: central tendency, dispersion, association, and visualizationInferential statistics: sampling distributions, the Central Limit Theorem, confidence intervals, hypothesis testing, p-values, Type I and Type II errors, and statistical powerMaximum Likelihood Estimation, with closed-form and numerical optimization, applied to Logistic and Normal modelsSimple and Multiple Linear Regression, derived via Ordinary Least Squares, with full model assessment (RMSE, R²) and per-coefficient significance testing using the hypothesis testing framework from earlier chaptersLogistic Regression, derived end-to-end from Maximum Likelihood Estimation (sigmoid, likelihood, Newton-Raphson), with assessment via confusion matrix, accuracy, precision, recall, specificity, ROC, and F1Who it is for:Students who want to break into data science or machine learning.Data scientists and ML engineers who learned statistics by absorption and want to fill the gaps.Software engineers transitioning into data science or machine learning.Candidates preparing for data science and quant interviews.Analysts who want statistical depth behind the methods they already use.Finish this book, and the gap between probability, statistics, and machine learning closes for good. Read more