March 2019
Beginner to intermediate
448 pages
13h 14m
English
Content preview from R Statistics Cookbook
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The method can also be used to generate random numbers for discrete distributions as well. For example, we can generate random numbers according to a Poisson distribution with a value λ = 5. As you can see in the histogram, we are generating a very similar amount of counts for each possible value that the random variable can take:
rpois_result = data.frame(rpois = rpois(10000,5))inverse_way = data.frame(inverse = qpois(runif(10000),5))total_table = cbind(rpois_result,inverse_way)transp_table = gather(total_table)colnames(transp_table) = c("method","value")ggplot(transp_table, aes(x=value,fill=method)) + geom_histogram(alpha=0.8,binwidth=1)
This yields the following overlaid histogram:
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