Felipe's Data Science Blog


Don 02 November 2017

LOO cross-validation with python

Posted by Felipe in posts   

There is a type of cross-validation procedure called leave one out cross-validation (LOOCV). It is very similar to the more commonly used $k-fold$ cross-validation. In fact, LOOCV can be seen as a special case of $k-fold$ CV with $k=n$, where n is the number of data points. In other words, LOOCV trains the statistical model on every possible set containing $n-1$ data points and then tests it on the $n^{th}$ point.

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