How to plot a shifted Gamma distribution
It is not hard to write your own function:
dsgamma <- function(x, x0=0, ...) {
dgamma(x-x0,...)
}
and similar for the other functions.
You might also want to look at ?curve for plotting (your plotting is
fine, curve is just another option).
On Thu, Feb 13, 2014 at 8:30 AM, Rodrigo Cesar Silva
<rodrigocesar.jo at gmail.com> wrote:
I have the parameters of a gamma distribution that I am trying to plot. The
parameters are shape = 2, scale = 5.390275 and the minimum value x0 is
65.44945.
Since the gamma is shifted by x0, we have
Mean = shape*scale + x0 = 76.23
My question is, how can I do it in r?
I was trying to use dgamma function, but I saw no options to offset the
gamma distribution. I can only use the shape and scale parameters, like
this:
x <- seq(from=0, to=100, length.out=100)
plot(x, dgamma(x, shape=2, scale=5.390275),
main="Gamma",type='l')
This generates a distribution with origin equal zero, but I want the origin
to be x0
How can I handle shifted gamma distribution in r?
Thanks a lot!
Rodrigo.
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