[R] "rbinom" not using probability of success right

From: Philip Twumasi-Ankrah <nana_kwadwo_derkyi_at_yahoo.com>
Date: Wed, 28 May 2008 05:53:26 -0700 (PDT)


I am trying to simulate a series of ones and zeros (1 or 0) and I am using "rbinom" but realizing that the number of successes expected is not accurate. Any advice out there.

This is the example:

N<-500
status<-rbinom(N, 1, prob = 0.15)
count<-sum(status)

15 percent of 500 should be 75 but what I obtain from the "count" variable is 77 that gives the probability of success to be 0.154. Not very good.

Is there another way beyond using "sample" and "rep" together?

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