US large cap market returns.

It was pointed out that the problem of ABT showing up as doing poorly for the year because of a stock split at the start of the year had crept back in.  That is fixed here, and hopefully for the rest of the year.

Fine print

• The data are from Yahoo
• Almost all of the S&P 500 stocks are used (as implied by Wikipedia on 2013 January 5 — see the R commands to scrape the data)
• The initial post was “Replacing market indices”
• The R code is in marketportrait_funs.R — you are free to use these functions however you like