Nathan Dabney wrote: > Do any of the R libraries have an implementation of the Inverse Error > Function (Inverse ERF)? > > ref: > http://mathworld.wolfram.com/InverseErf.html > http://functions.wolfram.com/GammaBetaErf/InverseErf/ > > Thanks, > Nathan > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Don't know of a built-in function, but you can try this: ## if you want the so-called 'error function' ## from ?pnorm erf <- function(x) 2 * pnorm(x * sqrt(2)) - 1 erf.inv <- function(x) qnorm((x + 1)/2)/sqrt(2) erf.inv(1) erf.inv(0) erf.inv(-1) erf.inv(erf(.25)) erf(erf.inv(.25)) erf.inv(.5) HTH, --sundar ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
