Hi Matthew, 

It is definitely acceptable to impute earlier questions as long as they overlap with other questions that are asked throughout the entire dataset and that those observed values predict the missing values. The key idea to consider is whether or not that data is missing at random (MAR) given you set of observed variables (see pg 4 of our vignette/documentation). If it is, then you can and should impute those observations. 

Hope that helps!

Cheers,
Matt

~~~~~~~~~~~
Matthew Blackwell
Assistant Professor of Political Science
University of Rochester
url: http://www.mattblackwell.org




On Thu, Nov 14, 2013 at 3:20 PM, DeMichele, Matthew <mdemichele@rti.org> wrote:

I have a question about the appropriateness of using Amelia to impute some data for items that were not asked in earlier years of a survey. I’m working with a governmental survey collection that started in 1975 and continues up to the present day. The data are in long form arranged by state and year. My question is that certain items were not asked in the earlier years that are asked now. Is appropriate to impute the data for these earlier years? Initially, I planned to develop multiple datasets to maximize years and states, but I started thinking this may be an imputation issue as well.

 

Best regards,

 

Matthew

 


--
Amelia mailing list served by HUIT
[Un]Subscribe/View Archive: https://urldefense.proofpoint.com/v1/url?u=http://lists.gking.harvard.edu/?info%3Damelia&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=jLgdG6f%2BQq4pzHWI0S37ROhc5Jfy9q9oKEsPDdQXskc%3D%0A&m=ye9%2FRpgELrol%2BEn7oUPshDjffMGguNCpz3ETPlSZ5%2FU%3D%0A&s=e0d8d8226141c0c58799504c6596958593befbfa6080ce8bd981f50276a05dc8
More info about Amelia: https://urldefense.proofpoint.com/v1/url?u=http://gking.harvard.edu/amelia&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=jLgdG6f%2BQq4pzHWI0S37ROhc5Jfy9q9oKEsPDdQXskc%3D%0A&m=ye9%2FRpgELrol%2BEn7oUPshDjffMGguNCpz3ETPlSZ5%2FU%3D%0A&s=ac1ac4d23c61675a23da3af6f97d04de9576897ca928c0c17d040c06bd126a04
Amelia mailing list
Amelia@lists.gking.harvard.edu

To unsubscribe from this list or get other information:

https://urldefense.proofpoint.com/v1/url?u=https://lists.gking.harvard.edu/mailman/listinfo/amelia&k=p4Ly7qpEBiYPBVenR9G2iQ%3D%3D%0A&r=jLgdG6f%2BQq4pzHWI0S37ROhc5Jfy9q9oKEsPDdQXskc%3D%0A&m=ye9%2FRpgELrol%2BEn7oUPshDjffMGguNCpz3ETPlSZ5%2FU%3D%0A&s=20346a43e06d5ab87f7654e0728a5e10626f07987849e362d244206cd852b4e0