[Gretl-devel] Gamma probability density function

Juan C. Estévez ecadrian.estevez at usc.es
Tue Feb 16 08:29:56 EST 2016


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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