Monte Carlo Simulation
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