add comparison of supervised learning algorithms to PML page

Author: justmarkham

pml.md

@@ -16,3 +16,7 @@ permalink: /pml/
 ## Machine Learning Competitions
 
 - [Participating in Kaggle's Allstate Purchase Prediction Challenge](http://www.dataschool.io/kaggle-allstate-purchase-prediction-challenge/): Description of what it's like to compete in a Kaggle competition, including links to a project paper, R code, presentation slides, and a presentation video.
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+## Choosing a Machine Learning Model
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+- [Comparing Supervised Learning Algorithms](http://www.dataschool.io/comparing-supervised-learning-algorithms/): Comparing 8 common supervised learning algorithms (for regression and classification) on 13 different dimensions.