Simple Stock Valuation

I appreciate Eddy Elfenbein.  He comes up with ideas that make me say, “Huh. Interesting.  Let's test that.”  His recent article, World's Simplest Stock Valuation Measure, put forth the idea that:
Growth Rate/2 + 8 = PE Ratio
Cool, reminds me of my 1993 formula for value investing:
Price per share < Tangible Book per share + 5 * EPS
Eddy's idea is that you can buy a company that isn't growing or shrinking earnings at a PE of 8, or alternatively, a E/P (earnings yield) of 12.5%.  In a weird environment like this, it means an earnings yield that is more than 9% over the long bond is a good purchase.  I like that idea, it offers a good reward for taking risk.
But as the growth rate rises, you can expand the PE multiple by half of the anticipated growth rate.  So, a company anticipated to grow at a 10% rate would warrant a PE multiple of 13, a 20% rate 18, etc.  I like his formula, because it is conservative.  It seeks growth at a reasonable price.  It will not overpay for high growth rates.
But now let's test this statistically to see what validity it presently has.  I ran a regression on Current year expected PEs versus expected 3-5 year growth rates.  I excluded all companies with fewer than two analysts putting forth growth estimates.  Here were the results:

 
Significant results statistically, but what a low R-squared.  Just shows us all how complex the market really is.  Look at this graph to see it as it is:

There really doesn't seem to be much of a relationship.  But Eddy's formula is conservative versus the estimates.  His formula invests in no-growth  companies  at an earnings yield of 12.5%, the market does so at an earnings yield of 8.4%.  His formula increases the PE multiple at a 50% rate as earnings increases, but the market does so at a 69% rate.
Good for Eddy, and any that follow him.  His method builds in a margin of safety, which is a key to all good investing.
Before I close I would like to offer the 20 most mispriced companies, both positively and negatively.  Just be aware that the markets are complex, and this valuation method is simple, and most likely wrong… but it can provide a jumping-off point for due diligence.
Potential Buys

 
Potential Sells