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Is there a way of aggregating 'zoo' daily data according to day of week? eg all Thursdays I came across the 'nextfri' function in the documentation but am unsure how to change this so any day of week can be...

Hi R-experts, I have a data frame (A) , and a subset (B) of this data frame. I am trying to create a new data frame which gives me all the rows of B, plus the 5th next row(occuring...

Dear List, Sorry if I'm overlooking something simple here but I have gotten a bit tangled. I am trying to print the next five values(with their dates), which occur after a certain condition is met. I have a...

Dear List, Thanks to those who helped with my enquiry a few days ago. I have a another question on loops, in this case I am trying to print out the row of a data frame if the previous 3...

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...

Dear List, Thankyou to Jim and Marc for their help on my previous question. I have a data frame of five columns, the first being a list of dates and the other four columns are numeric values. I wanted to...

Hi R-experts, I have a large set of weekly data in this format: 2007-01-05 -1.52377151 2007-01-12 1.04787390 2007-01-19 0.61647047 2007-01-26 1.87864283 2007-02-02 0.54992405 2007...

Dear R-experts, Sorry if I've overlooked a simple solution here. I have calculated a proportion of the number of observations which meet a criteria, applied to five years of data. How can I break down this proportion statistic...

Thankyou Achim. Along these lines, how might I extract subsets from that set by day of week? eg: create a new series that includes Mondays only. Thanks, Alf ----- Original Message ----- From: "Achim Zeileis" <Achim.Zeileis at R-project.org> To...

Hi R-experts, Thanks very much to Jim Holtman and Gabor on my previous question. I am having another problem with data manipulation in zoo. The following is data (Z) for first business day of every month in zoo format...

Thankyou for your reply Gabor. Your code helped me get started in creating id for each week of month. What I'm really looking for though is a more general application where I can extract each final week of the...