using gampdf and gamfit

2014 3 14
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更新时间：2015 10 31
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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

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Star Strider
Star Strider 2014-3-14
Consider:
Y = gamrnd(9, .5, 40, 1);
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

0 个投票

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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Donatas
Donatas
2014-3-14

编辑：

Amr Hashem
Amr Hashem
2015-10-31

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