Re: [R] Quantiles of a subset of data
bradleyd wrote > Thanks Pete. The TRIM argument in the MEAN function tells me how to trim > off decimal points, but I am lost as to how to append the mean values of > TEMP and IBI between the 10% and 90% quantiles of DAY in each YEAR. > > DAY is the julian date that an event occurred in certain years. The events > occurred numerous times in each year, and I want to be able to say what > the mean day was in each year excluding those days greater than the 90% > and less than the 10% quantile in that year. Would suggest that you forward a small, reproducible example with what you expect the results to look like. Pete -- View this message in context: http://r.789695.n4.nabble.com/Quantiles-of-a-subset-of-data-tp4659063p4659099.html Sent from the R help mailing list archive at Nabble.com. __ 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.
Re: [R] Quantiles of a subset of data
bradleyd wrote > That does it, thanks. Do you think you help me a little bit further? > > I actually have 4 columns, YEAR, DAY, TEMP , and IBI. They are all > numeric. I need to calculate the average TEMP and IBI values between the > 10% and 90% quantiles for each YEAR. > > The code * > by(data$day,data$year,day,c(0.1,0.9)) * > was correct in that it calculated the quantile values as intended, but I > don't know how to then calculate the mean TEMP and IBI values encompasses > within those quantiles. > > Thanks again, > David have a look at trim argument of the mean function ?mean Pete -- View this message in context: http://r.789695.n4.nabble.com/Quantiles-of-a-subset-of-data-tp4659063p4659086.html Sent from the R help mailing list archive at Nabble.com. __ 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.
Re: [R] Quantiles of a subset of data
bradleyd wrote > Thanks for your help Pete. I can almost get it to work with; > >> by(day,year,quantile) > > but this only gives me 0% 25% 50% 75% 100%, not the ones I'm looking > for, 10% and 90%. > > I have tried; > >> by(day,year,quantile(c(0.1, 0.9))) but this is rejected by > Error in FUN(X[[1L]], ...) : could not find function "FUN" Need to add the quantiles of interest . # Dummy Data d <- data.frame(year=c(rep(2010,10),rep(2011,10),rep(2012,10)), quantity = c(1:30)) # Quantiles by Year by(d$quantity,d$year,quantile,c(0.1,0.9)) HTH Pete -- View this message in context: http://r.789695.n4.nabble.com/Quantiles-of-a-subset-of-data-tp4659063p4659072.html Sent from the R help mailing list archive at Nabble.com. __ 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.
Re: [R] Quantiles of a subset of data
bradleyd wrote > Excuse the request from an R novice! I have a data frame (DATA) that has > two numeric columns (YEAR and DAY) and 4000 rows. For each YEAR I need to > determine the 10% and 90% quantiles of DAY. I'm sure this is easy enough, > but I am a new to this. > >> quantile(DATA$DAY,c(0.1,0.9)) > 10% 90% > 12 29 > > But this is for the entire 4000 rows, when I need it to be for each YEAR. > Is there no way to use a "by" argument in the quantile function? > > Thanks for any help you can provide. > David check out ?aggregate or ?by should be of help HTH Pete -- View this message in context: http://r.789695.n4.nabble.com/Quantiles-of-a-subset-of-data-tp4659063p4659064.html Sent from the R help mailing list archive at Nabble.com. __ 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.
