Dear Murthy,
If you would like to use the informative prior, you can approximate the
posterior of the previous year using the normal distribution (e.g.,
compute the sample mean and variance of the posterior and use them as the
parameters of the normal prior).
Hope this helps,
Kosuke
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Kosuke Imai Office: Corwin Hall 041
Assistant Professor Phone: 609-258-6601
Department of Politics eFax: 973-556-1929
Princeton University Email: kimai(a)Princeton.Edu
Princeton, NJ 08544-1012
http://imai.princeton.edu
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On Tue, 8 Aug 2006, Murthy Mittinty wrote:
Dear Prof Kosuke,
Myself Murthy.N.Mittinty. I am currently working at NIWA in New Zealand. For
one of my projects I am using the Zelig package that you had developed in R.
In this I am making use of logit.bayes and mlogit.bayes models.
I had gone through the webpage examples given in Gary king's web page and
used the same syntax and could get results. I am happy till this aspect.
But I have a question on the prior and supplying the prior, the current
program uses as flat prior which follows Normal distribution with mean b and
variance B (Var-cov) computed from the data. Since my work needs to take the
posterior of the previous year as the prior for predicting next year
proportion of fish in a catch, how can I supply this information to the
current program? Is there a way for used to define priors?
I will be thankful to you for your advise help and suggestions on this
aspect.
Thanks for your help and time.
Sincerely,
Murthy.N. Mittinty
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