See aggregate.zoo and maybe ?rollapply For date manipluations see R News 4/1 help desk article and the table at the end of that article, in particular. Suggest you also read and follow the last line on every r-help message when posting.
On 12/10/06, Alfonso Sammassimo <[EMAIL PROTECTED]> wrote: > Hi all, > > Please forgive this newbie posting to the list for the first time if I > haven't followed proper procedure. I have read through many of the archives > and find them most useful in learning R. > > I have ten years daily data (stock closing prices) which I read in zoo > format. I am having problems coding R to run a count of how many days in > each month have a price higher than the first day of that month. I then wish > to compare counts for all months. Along these lines, is there a simple way > to index to certain dates(eg first of month, last of month, any specific > date in one month) and keep looping over each month using such a reference > point, and then assessing the results for each month? > > Any guidance would be sincerely appreciated, > > Alfonso Sammassimo > Melbourne, Australia. > > ______________________________________________ > [email protected] 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. > ______________________________________________ [email protected] 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.
