Re: [R] Monte Carlo Simulation

From: Ista Zahn <izahn_at_psych.rochester.edu>
Date: Fri, 15 Apr 2011 15:04:01 -0400

Hi Shane,
See ?rbinom, ?rnorm, ?mvrnorm (in the MASS package), ?sample, ?for and ?write.table

Best,
Ista

On Fri, Apr 15, 2011 at 2:49 PM, Shane Phillips <SPhillips_at_lexington1.net> wrote:
> Hello, R friends...
>
> I am very new to R, and I need some help.  I am trying to construct a simulation for my dissertation.
>
> I need to create 1000 datasets of 1000 subjects with the following variables...
>
> Treatment variable - Drawn from a binomial distribution (1 run, prob=.13)
> Covariate 1 - Drawn from a normal distribution (mean=100, sd=16)
> Covariate 2 - Drawn from a normal distribution (mean=200, sd=9)
> Covariates 1 and 2 need to be correlated (say, r=.80)
> Covariate 3 - Drawn from a binomial distribution (1 run, prob=.5)
> Covariate 4 - Drawn from a distribution of discrete variables where 1 has an 80% chance of being selected, 2  - 10%, 3 - 5% and 4 - 5%.  This variable would need to be recoded into 4 binary variables.
> Covariate 5 - Drawn from a normal distribution (mean=84, sd=2)
> Covariate 6 - Drawn from a binomial distribution (1 run, prob=.15)
> Covariate 6 needs to correlate with Covariate 2 (r=.70, or so)
>
> I need each dataset saved as a new datafile with an iterative filename (e.g. sample1, sample2, etc.).
>
> Please help!
>
> Thanks!
>
> Shane
>
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>

-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org

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Received on Fri 15 Apr 2011 - 19:11:33 GMT

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