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- From: jerry@nutmeg.hnrc.tufts.edu (Jerry Dallal)
- Newsgroups: sci.math.stat
- Subject: Multi-dimensional parameters in Bayesian inference
- Message-ID: <1992Sep13.182142.368@nutmeg.hnrc.tufts.edu>
- Date: 13 Sep 92 23:21:42 GMT
- References: <1992Sep10.124312.4391@cognos.com> <11SEP199206534334@amarna.gsfc.nasa.gov> <WVENABLE.92Sep12234508@algona.stats.adelaide.edu.au> <BuJ7v8.EKM@mentor.cc.purdue.edu>
- Organization: USDA HNRC at Tufts University
- Lines: 25
-
- In article <BuJ7v8.EKM@mentor.cc.purdue.edu>, hrubin@pop.stat.purdue.edu (Herman Rubin) writes:
-
- > But one thing to keep in mind--the higher the
- > dimension, the more important the assumptions.
- > --
-
- I'm glad to see someone of Prof. Rubin's stature make this statement. Although
- I've spent a good deal of time studying Bayesian methods (I consider myself
- to have mastered the theory up a level represented by Lee's book), I am not
- doing mathematical research in this area. Some very good Bayesians have
- made statements similar to Professor Rubin's, namely, that in multi-dimensional
- problems the joint behavior of the parameters is more important than their
- marginal behavior. However, I have heard other knowledgeable Bayesians say
- that in many problems, the solution is robust to assumptions about joint
- behavior. And I'm willing to admit that I have neither the honed skills nor
- burning interest to investigate the issue for myself. Intuition tells me Rubin
- is correct. I would appreciate a brief statement or two from those in the know
- about just how serious this problem is. Is there a wide variety of cases that
- are inference robust to assumptions about joint behavior? Or should I run for
- the hills when someone writes, "Assuming *independent* non-informative priors
- for theta1 and theta2 . . . "?
-
- (Note: the use of *non-informative* rather than *improper* or *uniform* was
- intentional. I mean it in the sense of Edwards, Lindman, and Savage where the
- priors, while non-informative, are nevertheless, proper.)
-