17 Jun
2008
17 Jun
'08
8:02 p.m.
SIMONE S DIETRICH wrote:
Hi.
I am trying to figure out two issues on Amelia II:
1) How to determine the q-order polynomials: The software allows one
to specify between 0-3. Since I am mostly interested in cross-section
shifts, setting it to 0 is not an option. But how would I determine to
which order I'd set them to? Also: in the Honacker and King (2006)
article on missing values LOESS or spline basis functions are
recommended. Does Amelia II offer insights about these two techniques
as well?
i'd start with the lower order polynomials and see whether they fit.
there are some examples of fit in the paper and some diagnostics in the
program.
2) How to set the case prior efficiently: I have 135 developing
countries in my data and would like to use a case prior to identify
existing similarities/differences between countries. Theoretically it
makes sense to group the countries by region/sub-region in terms of
their similarity. Is it possible to identify countries' similarities
by regions/sub-regions rather than making pairwise assessments? Also:
the above-mentioned Honacker and King (2006) article talks about
observational priors but does not discuss the advantages/drawbacks of
case priors. Could you help me out here?
not sure what you mean by 'case'
priors. but you might want to consider
adding in fixed effects for regions, which might get you what you want.
otherwise you can set the priors on individual cell values if you like.
Best of luck with your research,
Gary
---
http://gking.harvard.edu
I look forward to your response.
Thanks very much!
Simone Dietrich
Ph.D. Candidate
The Pennsylvania State University
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