[R] "reverse" quantile function
Andras Farkas
motyocska at yahoo.com
Thu Jun 15 21:37:21 CEST 2017
Dear All,
we have:
t<-seq(0,24,1)
a<-10*exp(-0.05*t)
b<-10*exp(-0.07*t)
c<-10*exp(-0.1*t)
d<-10*exp(-0.03*t)
z<-data.frame(a,b,c,d)
res<-t(apply(z, 1, quantile, probs=c(0.3)))
my goal is to do a 'reverse" of the function here that produces "res" on a data frame, ie: to get the answer 0.3 back for the percentile location when I have "res" available to me... For a single vector this would be done using ecdf something like this:
x <- rnorm(100)
#then I know this value:
quantile(x,0.33)
#so do this step
ecdf(x)(quantile(x,0.33))
#to get 0.33 back...
any suggestions on how I could to that for a data frame?
thank you,Andras Farkas
More information about the R-help
mailing list