Dogs vs. Flying Five vs. Net Payout Yield

Is the US Subprime Crisis Any Different? A historical comparison referenced in the Economist article Same As It Ever Was. (Thanks to reader DM for the link.)

—-
100 Hedge Funds to watch.

—-

Flying Five (Link to original post here.)
Dogs of the Dow (Link to original post here.)
Net Payout Yield (Link to original post here.)

Dogs of the Dow is simply to top ten stocks in the Dow sorted by dividend yield.
Flying Five further sorts those by lowest price.
Net Payout yield is the top ten Dow stocks sorted by net payout yield.

For the past 30 years or so the Dogs strategy has outperformed the DOW by ~ 3% per annum, and the Net Payout Yield strategy another 3% on top of that (ditto for Flying Five). But are the results simply data mining? The NPY strategy certainly sits the best with me of any of them.

All three performed below the DJIA Index in 2007:

DOW: 6.43%
DOGS: 2.22%
Flying Five: 4.18%
NPY: 6.3%

The 2008 names for Dogs, Flying Five, and Payout Yield are below:

Dogs of the Dow:
C
PFE
GM
MO
VZ
T
DD
JPM
GE
HD

Flying Five:
PFE
GM
HD
C
GE

Payout Yield (only 40% overlap with the Dogs):
HD
IBM
HON
DIS
PFE
JPM
AA
C
XOM
HPQ