Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: Incomplete Beta Function


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Incomplete Beta Function
Date   Mon, 18 Feb 2013 11:19:35 +0000

There is some confusion here, if only of terminology. The incomplete
beta function is not something whose parameters are estimated. Your
problem is presumably that you want to fit a model of some kind based
on the incomplete beta function, but without knowing what that model
is precisely, the only advice is to check whether a program exists and
if needed to write your own -ml- program.

Please note further that you are asked to use full real names on
Statalist: neither Catia nor nicostat qualifies. Also, for "Maarteen"
read "Maarten".

Nick

On Mon, Feb 18, 2013 at 11:12 AM,  <nicostat@gmail.com> wrote:
> Thanks Maarteen,
> yes  I need to estimate the parameters a and b of this beta incomplete
> function by ml.
> Thanks
> Catia
>
> 2013/2/18 Maarten Buis <maartenlbuis@gmail.com>:
>> On Sun, Feb 17, 2013 at 9:15 PM,  <nicostat@gmail.com> wrote:
>>> I would like to estimate incomplete Beta function such as this below
>>> trough maximum likelihood I can performance this in Stata?
>>>
>>> (y*/50) = I (a, b)
>>> where I(a, b) is the incomplete Beta function ratio with parameters a and b.
>>
>> What is your question? Do you want to incomplete Beta function? Than
>> type in Stata: -findit incomplete beta function-. Do you want to
>> estimate the paramters a and b? Than you need to write down your
>> log-likelihood function and use -ml- to maximize that. In that case
>> you will want to have access to:
>> <http://www.stata.com/bookstore/maximum-likelihood-estimation-stata/>.
>>
>
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index