Dear Ophelia Random sampling is extremely easy to do in SAS. Just visit
http://support.sas.com/techsup/sample/random.html Just copy the fully commented code and paste it into your program. There, you will find the code to do: 1) simple random sampling (with or without replacement) and 2) many varieties of stratified random sampling (e.g. with and without replacement, equal allocation, unequal allocation...) You will also find SAS code to directly perform bootstrapping, crossvalidation, and jackknifing for every statistic that you could calculate in SAS (which is darn near everything in the statistical realm...). For lots of SAS code to do a huge variety of things, visit www.sas.com then select Tech support, then just type in a few search words for what you are trying to do (e.g. " Akaike's Information Criterion" or "Schwarz's Bayesian Criterion" ). You will be hard pressed to NOT find the code to do what you need to do! It is hard to match SAS for the sort of thing you ask about... John P. Ball > Date: Wed, 11 Apr 2007 00:49:37 -0500 > From: Ophelia Wang <[EMAIL PROTECTED]> > Subject: Question about random sampling > > Hi, > I have a data set that has about 15,000 data points (rows) that document > values of 15 variables (columns). Now I'd like to perform a random sampling > process (run 10,000 times) to randomly select 470 points and get the mean > values of my 15 variables (columns) out of these 470 points after the 10,000 > times of random sampling. Can anyone tell me how to write a script in SAS, > SYSTAT, R or S-Plus to perform this analysis? Or are there other methods I can > use? Thanks a lot! Ophelia > -- > Ophelia Wang > Doctoral student ########################################### This message has been scanned by F-Secure Anti-Virus for Microsoft Exchange. For more information, connect to http://www.f-secure.com/
