[R] How to monthly,daily,yearly average
Sorry, this is my first time to post. I have a big data set: first colume is date (ex: 2008-2-150, the second is time (10:30:00), and the following columes are variaty measurement data. Every 30 min, I have one data. I want to find an effecient way to calculate the hourly, daily, monthly and yearly average, and plot them, and eventually use these average data to do further analysis. Thanks! Jeff [[alternative HTML version deleted]] __ 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] How to monthly,daily,yearly average
Check as.Date Date: Wed, 11 Mar 2009 06:25:44 -0700 From: qflic...@yahoo.com To: r-help@r-project.org Subject: [R] How to monthly,daily,yearly average Sorry, this is my first time to post. I have a big data set: first colume is date (ex: 2008-2-150, the second is time (10:30:00), and the following columes are variaty measurement data. Every 30 min, I have one data. I want to find an effecient way to calculate the hourly, daily, monthly and yearly average, and plot them, and eventually use these average data to do further analysis. Thanks! Jeff [[alternative HTML version deleted]] __ 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. _ News, entertainment and everything you care about at Live.com. Get it now! http://www.live.com/getstarted.aspx [[alternative HTML version deleted]] __ 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] How to monthly,daily,yearly average
Here is an example. See the three vignettes in zoo: vignette(zoo) and R News 4/1 for info on dates. # assume this input Lines - Date Time Value 01/01/08 00:00:00 1 01/01/08 00:30:00 2 01/01/08 01:00:00 3 01/01/08 01:30:00 4 01/01/08 02:00:00 5 01/01/08 02:30:00 6 01/01/08 03:00:00 7 01/01/08 03:30:00 8 01/01/08 04:00:00 9 # read in the data, convert it to zoo, aggregate it and plot library(zoo) library(chron) # DF - read.table(myfile.dat, header = TRUE, as.is = TRUE) DF - read.table(textConnection(Lines), header = TRUE, as.is = TRUE) # next line may need to specify formats, if different z - zoo(DF$Value, chron(DF$Date, DF$Time)) # hourly aggregation z.hr - aggregate(z, trunc(time(z), 01:00:00), mean) plot(z.hr, type = o) # daily aggregation z.day - aggregate(z, trunc, mean) plot(z.day, type = o) # monthly aggregation z.mo - aggregate(z, as.yearmon, mean) plot(z.mo, type = o) # yearly aggregation z.yr - aggregate(z.mo, floor, mean) plot(z.yr, type = o) On Wed, Mar 11, 2009 at 9:25 AM, Qianfeng Li qflic...@yahoo.com wrote: Sorry, this is my first time to post. I have a big data set: first colume is date (ex: 2008-2-150, the second is time (10:30:00), and the following columes are variaty measurement data. Every 30 min, I have one data. I want to find an effecient way to calculate the hourly, daily, monthly and yearly average, and plot them, and eventually use these average data to do further analysis. Thanks! Jeff [[alternative HTML version deleted]] __ 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. __ 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.
