Re: [R] Simulation help

From: ONKELINX, Thierry <Thierry.ONKELINX_at_inbo.be>
Date: Wed 20 Sep 2006 - 14:07:31 GMT


This should work. I try to avoid for loops because large (or nested) for loops tend to consume a lot of memory.

one.dataset <- function(dummy = 0, slope = 0.01){   return(c(yr1= mean(rbinom(50,1,.5)), yr2 =mean(rbinom(50,1,.5 + slope)), yr3 =mean(rbinom(50,1,.5 + 2 * slope)), yr4 =mean(rbinom(50,1,.5 + 3 * slope)), yr5 =mean(rbinom(50,1,.5 + 4 * slope))))
}

datasets.slope01 <- t(sapply(1:100, one.dataset, slope = 0.01)) datasets.slope05 <- t(sapply(1:100, one.dataset, slope = 0.05))

Cheers,

Thierry



ir. Thierry Onkelinx

Instituut voor natuur- en bosonderzoek / Reseach Institute for Nature and Forest

Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance

Gaverstraat 4

9500 Geraardsbergen

Belgium

tel. + 32 54/436 185

Thierry.Onkelinx@inbo.be

www.inbo.be

-----Oorspronkelijk bericht-----
Van: r-help-bounces@stat.math.ethz.ch
[mailto:r-help-bounces@stat.math.ethz.ch] Namens Zodet, Marc W. (AHRQ) Verzonden: woensdag 20 september 2006 15:29 Aan: r-help@stat.math.ethz.ch
Onderwerp: [R] Simulation help

I'm trying to simulate trend data over a five year period. I want different trend profiles...the simplest being a linear trend. I've been using the following code:  

patBdta1 <- NULL

for(i in 1:100)

patBdta1 <- rbind(patBdta1,c(yr1= mean(rbinom(50,1,.50)),

                             yr2 =mean(rbinom(50,1,.51)),

                             yr3 =mean(rbinom(50,1,.52)),

                             yr4 =mean(rbinom(50,1,.53)),

                             yr5 =mean(rbinom(50,1,.54))))

 

This code creates 100 data sets each with a 5 yr binomial trend profile with a slope of approximately .01.  

Now, what I want to do is pass this code (or some code) in such a way that I can simulate various trend slopes (i.e., pass in a loop or vectorize vs. copying/repeating code for each slope).  

Any guidance is much appreciated. Thanks!  

Marc  

Marc W. Zodet, MS

Senior Health Statistician

Agency for Healthcare Research and Quality

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