20 Apr
2008
20 Apr
'08
3:15 a.m.
Hi,
Would anyone know what the theta in the gamma function refers too? I am
writing my negative binomial function and am not exactly sure what theta
represents.
Thank you
Aaka
20 Apr
20 Apr
9:54 a.m.
Check Zelig manual pg. 352 in the pdf version on the Zelig website. Theta
refers to the parameter of the gamma distribution (which in the context of
the neg. binomial can be thought of as a dispersion parameter).
From: gov2001-l-bounces at lists.fas.harvard.edu
[mailto:gov2001-l-bounces at lists.fas.harvard.edu] On Behalf Of Aakanksha
Pande
Sent: Sunday, April 20, 2008 3:15 AM
To: gov2001-l at lists.fas.harvard.edu
Subject: [gov2001-l] Theta in gamma function
Hi,
Would anyone know what the theta in the gamma function refers too? I am
writing my negative binomial function and am not exactly sure what theta
represents.
Thank you
Aaka
11:42 a.m.
I'm also finding it a bit difficult to get a feel for this too. Using
the Zelig parameterization - the Gamma distribution has just one
parameter, yet everywhere else it has two. I can see that the
variance is altered as per the Zelig manual and this makes intuitive
sense - at a fairly shallow level. But why 1/theta*Gamma(theta) and
how does this square with the two parameter version in Gary's slides?
A graph would help get a feel, but all the graphs I can find have two
parameters.
Jeremy
On 20 Apr 2008, at 14:54, Jens Hainmueller wrote:
Check Zelig manual pg. 352 in the pdf version on the
Zelig website.
Theta refers to the parameter of the gamma distribution (which in
the context of the neg. binomial can be thought of as a dispersion
parameter).
From: gov2001-l-bounces at lists.fas.harvard.edu [mailto:gov2001-l-
bounces at lists.fas.harvard.edu] On Behalf Of Aakanksha Pande
Sent: Sunday, April 20, 2008 3:15 AM
To: gov2001-l at lists.fas.harvard.edu
Subject: [gov2001-l] Theta in gamma function
Hi,
Would anyone know what the theta in the gamma function refers too?
I am writing my negative binomial function and am not exactly sure
what theta represents.
Thank you
Aaka
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2 comments
3 participants
participants (3)
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apande＠fas.harvard.edu -
jeremy.hodgen＠kcl.ac.uk -
jhainmueller＠gmail.com