On Mon, Sep 7, 2009 at 1:22 PM, Noah Silverman<n...@smartmediacorp.com> wrote: <SNIP> > > The data is listed in our CSV file from newest to oldest. We are supposed > to calculated a valued that is an "average" of some items. We loop through > some queries to our database and increment two variables - $total_found and > $total_score. The final value is simply $total_score / $total_found. > <SNIP>
This does seem like it's rife with possibilities for non-causal action. (Assuming you process from newest toward oldest which is what I think you say you are doing...) I'm pretty sure that if I knew that the Dow was going to be higher 3 months from now then my day trading results would tend toward long vs short and I'd do better. Unfortunately I don't know where it will be and cannot really do that. Have you considered processing the data in the other direction. Not in R, but rather reversing the data frame or better yet writing the csv file in date order? Cheers, Mark ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
