[R] Help on calculating a variable using random numbers

From: Shane Phillips <SPhillips_at_Lexington1.net>
Date: Mon, 11 Apr 2011 16:16:35 -0400


I'm new to R, but I'm trying to write a program for a dissertation that generates a dataset as follows...

subject=1:1000
treat=rbinom(1*1000,1,.13)
gender=rbinom(1*1000,1,.5)
eth=runif(1*1000, min=1, max=4)
cogat=rnorm(1*1000, 100, 16)
map=rnorm(1*1000, 200, 9)         

simtest=data.frame (subject=subject, treat=treat, gender=gender, eth=round(eth,digits=0), cogat=round(cogat,digits=0),map=round(map,digits=0)) simtest

I need to add a variable named "growth". If the "treat" variable for an observation is 0 then "growth" needs to be a randomly generated a number from a normal distribution with a mean of .1 and a sd of .03. If the "treat" variable is 1 then "growth" needs to be a randomly generated a number from a normal distribution with a mean of .5 and a sd of .03.

Please help!



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