From my memory, MATLAB's documentation not only discusses the implementation, but also discusses the statistical/engineering methodology. It's overkill and can

From my memory, MATLAB's documentation not only discusses the implementation, but also discusses the statistical/engineering methodology. It's overkill and can be pretty annoying (paging back and forth between different parts of the help can be somewhat time consuming) when you actually know the statistics but just want to understand the implementation. Hence the distinction between "documentation" and "a tutorial". I don't know whether it's an explicit or implicit design choice or just a happy accident, but I'm grateful that the R documentation doesn't try to hold anyone's hand and guide them through data analysis beyond their training.