On 12-12-2013, at 14:56, Johannes Radinger <johannesradin...@gmail.com> wrote:
> Hi, > > > > I found follwowing example of pnorm here: > > http://www.r-tutor.com/elementary-statistics/probability-distributions/normal-distribution > > > > Problem > > Assume that the test scores of a college entrance exam fits a normal > distribution. Furthermore, the mean test score is 72, and the standard > deviation is 15.2. What is the percentage of students scoring 84 or more in > the exam? > > > > Solution > >> pnorm(84, mean=72, sd=15.2, lower.tail=FALSE) > > [1] 0.21492 > > > > That is straight forward, however what if I want to know the score the best > 30% students are reaching at least. So I know the solution of pnorm but > want to know its q. How can that be achieved in R? > > > > Any suggestions? Do ?pnorm in R. You are directed to a help page where you will also see “qnorm”. Then try qnorm. Berend ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
