What proof? Kindly elaborate the problem.

moments can be expressed as incomplete gamma functions.

Dear Mahmoud

I found an old paper that may be useful "Estimating the parameters of a Truncated Gamma Distribution", of Chapman

http://projecteuclid.org/download/pdf_1/euclid.aoms/1177728272

It has an interesting bibliography too.

I hope this help.

Other paper:

Maximum Likelihood Estimation from a Left-Truncated Gamma Distribution file:///C:/Users/gramos/Downloads/155167.pdf

Thank you Guillermo. Could you please write the url of the second paper?

Ok Mahmoud. I am sorry for my error. Here it is:

http://www.documbase.com/Gamma-Distribution-Example.pdf

Sorry to disturb you again Guillermo. But it did not work and the file failed to download.

Mahmoud: check your email for some related papers. Best.

Thank you very much Subrata. I apprecaiate that so much.

Mahmoud: my pleasure if it is of any help to you.

Dear Mahmoud

I am sending it as adjoint.

Guillermo

Thank you very much Subrata and Guillermo. You were of great help..