Weibull fit 3 parameters

2016 5 23
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更新时间：2016 5 23
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Hi,
I need to fit a series of data points(1000) using a 3 parameter Weibull distribution. Can I get some help?
Thanks

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Torsten
Torsten 2016-5-23

0 个投票

Use MATLAB's "mle". Therein, supply pdf and cdf of the 3-parameter Weilbull distribution as a custom distribution.
Best wishes
Torsten.

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Isma_gp
Isma_gp 2016-5-23
custpdf = @(x,a,b,c) c*a*b*x^(b-1)*exp(-a*x^b);
custcdf = @(x,a,b,c) 1-exp(-a*(x-c)^b);
phat = mle(data, 'pdf', custpdf(data,a,b,c), 'start', 0,'cdf',custcdf)
How do I get the three parameters first in this case?
Torsten
Torsten 2016-5-23
编辑：Torsten 2016-5-23
I don't understand your question.
You will have to supply a row vector with three elements as "start" in the code above.
Best wishes
Torsten.
Isma_gp
Isma_gp 2016-5-23
The question is how to get the 3 parameters in order to be able to use them with the mle function?
Torsten
Torsten 2016-5-23
编辑：Torsten 2016-5-23
Which three parameters ?
Give senseful values for a, b and c in the vector "start". After the call to mle, phat will contain the optimal parameters ahat, bhat and chat (deduced from your vector "data").
Best wishes
Torsten.

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Isma_gp
Isma_gp
2016-5-23

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Torsten
Torsten
2016-5-23

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