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Nobody can predict where stock prices will go next, can they? Especially given the volatility of stock prices, especially in today's market, where the market can swing by more than 3% in any given day, right?

It's just not possible, is it?

To really find out, we ran a two-year long experiment, from April 2009 through April 2011, to see if we could forecast the average value of stock prices for a month at the end of the previous month. Here were our final results:

(Click charts to expand)

S&P 500 Average Monthly Index Value, April 2009 to April 2011

As you can see, we offered a split final forecast option for April 2011. Here's what we believed would happen instead:

What we believe is likely is that stock prices will track upward from the average level of 1304 they recorded in March 2011 toward the 1393-1429 level our primary method would forecast as the noise currently in the market subsides.

And that's what happened. In April 2011, stock prices did indeed track upward, rising to an average level of 1331 for the month, with the S&P closing the month at 1363.61.

We took the next several months off from offering public forecasts of where the S&P 500 (SPY) would head next, but by 26 September 2011, we couldn't resist any more, and posted the following chart, which presents a graphical prediction that happens to cover the period through the end of 2011:

S&P 500 Average Monthly Index Value vs Trailing Year Dividends per Share, December 1991 through 23 September 2011

And here's what the updated chart looks like, through the end of 16 December 2011:

S&P 500 Average Monthly Index Value vs Trailing Year Dividends per Share, December 1991 through 16 December 2011

What can we say? We're still in the zone! And that concludes, for real this time, our public experiment in forecasting the future for the S&P 500!

Source: S&P 500: In The Zone