I don’t download the SP500EPSEST.xls file every day but probably every couple of weeks, I check it out to see what’s changed. Unfortunately, I haven’t been able to find any source of data that watches the forecast changes from S&P over time. (If anyone knows of one, please let me know.) Every time I’ve opened the file, the revision to Q4 earnings has been negative.
But it helps to contextualize these revisions. So, the next two charts that illustrate this well. The first shows operating EPS (operating omits write-offs/downs) on a linear scale from 1988 to Q4/2009. The second is the same chart but with a log scale for the EPS side only. The pink line uses the actual operating EPS data. (SPX data was only included up to the end of the actual EPS data series and so stops on 9/30/08.)
Going back to the linear scaled chart, the period marked out from points 1 to 2 (Q2/92-Q2/98) had an average quarter-to-quarter percentage
Making a somewhat optimistic assumption of quarterly EPS growth being an average of the 1-2 and 3-4 periods (4.08%) reduces the forecast considerably.
The forward PE for S&P's forecast at 850 is 10.51. For the reduced forecast it is 11.73. AQR's Cliff Asness has estimated forward PEs have historically been around 11. Considering the optimism of S&P's estimates and how much they've been revised downward, assigning a fair value to SPX at this point would be tricky at best. I'll revisit this in the future with respect to historic yields and PEs a bit more.
Sources:
http://www2.standardandpoors.com/spf/xls/index/SP500EPSEST.XLS
http://www.hussmanfunds.com/wmc/wmc070402.htm
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