Probability and Statistics for Programmersby Allen B. Downey, published by O'Reilly Media.
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Think Stats is an introduction to Probability and Statistics for Python programmers.
This book is under the Creative Commons Attribution-NonCommercial 3.0 Unported License, which means that you are free to copy, distribute, and modify it, as long as you attribute the work and don't use it for commercial purposes.
Other Free Books by Allen Downey are available from Green Tea Press.
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