If one could apply the weekly moving average as a trending indicator for the S&P 500 index in the last 18 months (Nov 2011 to present) , then he/she would be able to make about 37% profit from this investment.
Below is the S&P 500 (SPY ETF) weekly chart showing the faster 10 week exponential moving average (EMA) had crossed above the slower 40 week EMA starting in Dec 2011 and continued to stay that way as of today. Normally when this happens, it is referred to as a bull market. There were two occasions (May and Nov 2012) that the 10 week EMA was touching the 40 EMA and was very close to reverse its pattern in moving below the 40 EMA which it is categorized as bear market. But the reversal did not happen and the trend continued to go up.
I used this method to position my core holding during this period and resulted with some decent profits. My position such as ABT, COP, DUK, ED, KMB, MCD, MSFT, and PM which I think it still looks good and have some more room to the up side.