[R] How to determine the pdf of a gamma distribution using the estimated parameters?

Ben Bolker bbolker at gmail.com
Fri Jul 12 18:57:56 CEST 2013

Kaptue Tchuente, Armel <armel.kaptue <at> sdstate.edu> writes:



> With th bar histogram (number of occurrences)
>  hist<-c(24,7,4,1,2,1,1) of seven equally spaces classes
> ]1-4], ]5-8], ]9-12], ]13-16], ]17-20], ]21-24], ]25-28], 
> I obtained shape=0.8276 and rate=0.1448.
> I would like to know how to build the continuous pdf of a this
> gamma distribution knowing these two estimated
> parameters such that I will be able to predict the pdf of any
> positive value.

  Are you talking about dgamma(x,shape=0.8276,rate=0.1448),
where x is the value you are trying to predict for?  dgamma gives
probability density, pgamma gives cumulative density/distribution

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