Corequity provides independent, institutional equity valuation research. The results are used to screen for the best and worst values out of over 500 equities on a continuous basis. We have accumulated a proprietary database of historical monthly valuation data. For a brief background... http://corequity.blogspot.com/2013/05/some-background.html
The following table contains the screens for the best and the worst values in the April 30th valuation. Below that is a look at the Sector bets that these equities represent compared to the S&P 500 Sector weightings.