Correlation: Lumber Vs. Housing

Apparently the lumber price is a leading indicator and a proxy for the housing market. (Zero Hedge)

If the lumber price goes up, 2 months later, the housing market goes up. The same happens the other way round.

So it's very important to watch the lumber price, which can be found here.
http://www.nasdaq.com/markets/lumber.aspx?timeframe=10y

And even more important, if this correlation is real, then you can just predict the market and earn money by betting on the direction of the market.