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03-28-2017 09:56 AM

Hello,

I am trying to fi a weibull distribution to a list of frequency data, and I am using the following code in SAS 9.4

**proc** **univariate** data=data1;

var group;

freq count;

histogram / weibull (Theta=est) midpoints=**1** to **28** by **1;**

**run;**

**I got my parameter estimates however SAS did not give me any Goodness of fit statistics. Is there a specific coding that allows me to get one?**

**Thank you **

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03-28-2017 10:02 AM - edited 03-28-2017 10:03 AM

You code looks correct and should give GOF tables. Run the following and see if you see the "Goodness-of-Fit Tests for Weibull Distribution" table

`ods trace on;`

proc univariate data=sashelp.cars;
var mpg_city;
freq cylinders;
histogram mpg_city / weibull (Theta=est) midpoints=10 to 60 by 2.5;
run;

ods trace off;

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Monday

The proposed code did not gice GOF tables unless c>2. I had to put in a value of theta to getW-sq and A-sq GOF statistics.

Is there another procedure available to fit a weibull distribution using point frequency data?

Thank you

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Monday

Yes, the documentation for the GOF tests in PROC UNIVARIATE mentions that the ECDF tests for GOF are only available when c > 2.

I'm not near a copy of Stephens and D'Agostino right now, so I can't look up why that constraint is required.