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Monthly Archives: February 2011
Collider Example
library (MASS) covar<mvrnorm(250, c(0, 0), matrix(c(1, 0.00, 0.00, 1), 2, 2)) mydata<data.frame(covar) names(mydata)<c("sat", "mot") mydata$admin< mydata$sat + mydata$mot mydata$admin2< ifelse (mydata$admin >=quantile(mydata$admin, .85), "pass", "fail") library(ggplot2) qplot(sat,mot, data = mydata, color = admin2) Created by Pretty R at insideR.org
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Stirling’s formula for R
I am sure it is out there but for my record keeping purposes and for anyone interested here is a quick function to find Stirling’s approximation of all possible permutations Stirling< function (n)((2*pi*n)^.5)*(n/exp(1))^n Created by Pretty R at insideR.org
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