using gampdf and gamfit

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Donatas
Donatas 2014-3-14
编辑： Amr Hashem 2015-10-31
I have found values of gamma distribution using
Y = gampdf(1:40,9,0.5)
Now, from the data I have, I want to estimate the parameters A and B with which I generated gamma distribution values. I mean, I want to get values of A and B near to the 9 and 0.5 respectively.
I have used gamfit function like this:
phat = gamfit(Y)
but I get wrong A and B values. Where is the mistake?
Thank you.
Donatas
  2 个评论
Donatas
Donatas 2014-3-15
But why is it not possible to estimate these values using
Y = gampdf(1:40,9,0.5)
I mean, I have a set of points which describes time-concentration curve and I need to fit gamma distribution.

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回答（1 个）

Amr Hashem
Amr Hashem 2015-10-31
编辑：Amr Hashem 2015-10-31
firstly you have to use:
Y= gamfit(Data) % use Data not Y
then use :
G= gampdf(X,A,B)
plot(X,G)
the parameters depends on your Data, you can't change them

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