# [Gretl-devel] Gamma probability density function

Juan C. Estévez ecadrian.estevez at usc.es
Tue Feb 16 08:36:08 EST 2016

```Sorry. I mean that in Matlab example, varies de B parameter, but in
gretl example I think that the X varies. No?

On 16/02/2016 14:32, Artur T. wrote:
> Yes, just the syntax differs but of course results should be the same.
>
> So you can confirm that Excel computes the same values as gretl does?
>
> Artur
>
> Am 16.02.2016 um 14:29 schrieb Juan C. Estévez:
>> No. Sorry I confuse de parameters. Excel makes gives de same results.
>>
>> On 16/02/2016 14:28, Juan C. Estévez wrote:
>>> Maybe Matlab calculates gamma(X, a, b), not gamma (a, b, X)?
>>>
>>> On 16/02/2016 13:08, Artur T. wrote:
>>>> Dear all,
>>>>
>>>> I am just trying to replicate this MATLAB example of the Gamma
>>>> probability density function:
>>>>
>>>> http://de.mathworks.com/help/stats/gampdf.html?requestedDomain=www.mathworks.com#zmw57dd0e292788
>>>>
>>>> According to this, Matlab yields for shape=scale=1 and a x-vector seq(1,5) :
>>>> y = 0.3679  0.3033  0.2388  0.1947  0.1637
>>>>
>>>> but with gretl I obtain correctly (just checked it with some statistical
>>>> tables)
>>>> y (1 x 5)
>>>> 0.36788 0.13534 0.049787 0.018316 0.0067379
>>>>
>>>> <hansl>
>>>> mu = seq(1,5)
>>>> y = pdf(g,1,1,mu)
>>>> </hansl>
>>>>
>>>> Just out of curiosity: What is Matlab doing? (the same results are
>>>> obtained by Octave)
>>>>
>>>> Artur
>>
>>
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