It looks like a two year benchmark, so I'm not sure it's really helpful for my goals.
In addition no individual stocks, just funds.
for example, you'll get a negative correlation between stocks and commodities. The last ones have been tanking pretty consistently the past few years and the first one we all know what happened there.
Same with financials, they had low correlation recently, but not end of 2008/2009 as we all know. Not enough data.
I'm much more interested in individual companies who tend to not go down as much when the market tanks, over a longer period of time. I'd like to see at least 20 years (although 10 is a good start).
The concept is really interesting though. Using morningstar (or bloomberg) data as source it should be possible to build something much more powerful (I won't do it though