US large cap market returns.

(For reasons unknown, the data for 2012-07-09 did not appear so what is shown as returns for 2012-07-10 is actually returns for both those days.)

Fine print

• The data are from Yahoo
• Almost all of the S&P 500 stocks are used
• The initial post was “Replacing market indices”
• The R code is in marketportrait_funs.R