[R] quantile of a discrete random variable

[David Winsemius]

On Jun 25, 2015, at 7:26 AM, L... L... wrote:

> Dear all, is there a general method for calculating the quantile of a discrete random variable? If yes, is there a R function to do this?

The `quantile` function would seem to be the first place to go. It may depend on the object-type of your representation of the "random variable".

?quantile                 # to see the help page

The default of type=7 may not be what you want, but I suspect one of the other types would be appropriate. You could also cobble something together along the lines of:

 list(x= as.numeric(names(table(x))), y=cumsum(table(x))/sum(x) )

Could use the result of ecdf(and then reversing x and y for evaluation.).

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David Winsemius
Alameda, CA, USA