Ed Yardeni Was Pru-Bache's Economist back in 1982

After market risk, the most influential factor in the performance of a stock is the sector performance (or sector risk).
Stan Weinstein (Secrets for Profiting in Bull and Bear Markets, page 338) recommends that you:

1. first determine the direction of the market;
2. then select the top-performing sectors; and,
3. finally, select the best stocks from within those sectors.

Ed Yardeni has provided a timely and informative analysis of S&P500 sector performance for your reading pleasure.

http://www.yardeni.com/pub/PEACOCKPERF.pdf

For those who need an update on Ed Yardeni, see below:

http://www.yardeni.com/pub/ey_bio_2.pdf