In January 2014, Stanford University professors Trevor Hastie and Rob Tibshirani (authors of the legendary Elements of Statistical Learning textbook) taught an online course based on their newest textbook, An Introduction to Statistical Learning with Applications in R (ISLR). I found it to be an excellent course in statistical learning

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As the 120-ton space shuttle sits surrounded by almost 4 million pounds of rocket fuel, exhaling noxious fumes, visibly impatient to defy gravity, its on-board computers take command.

In Fearless Refactoring: Rails controllers I'll teach how to improve your Rails controllers in a quick and safe way. This is step-by-step guide so you won't feel lost. Every step is described in every detail, with code changes. All of that, so that you can safely refactor your codebase, even without a full test coverage.

Ganesh Prasad proposes minimizing service dependencies in a SOA implementation rather than avoiding point-to-point connections in order to obtain a more flexible system that can evolve over time.

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Thorough and practical intro to concurrency and parallelism in Ruby. Read about forking, multithreading, the Global Interpreter Lock (GIL), and more.

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Easily choose between open-source load testing tools according to your needs. Compare pros and cons of different performance testing solutions.