Using statistic to assess risk of a stock vs S & P 500 index for performance comparison

This could be important for the pile of indicators I want to use to assess risk of past performance of an asset

Very cool to script to help me assess the risk moving forward on particular market asset

– See more at: http://quantlabs.net/blog/2014/10/using-statistics-to-assess-risk-of-a-stock-vs-s-p-500-index-for-performance-comparison/#sthash.E2MxT4h2.dpuf