14 Nov
2013
14 Nov
'13
3:55 p.m.
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(a)rti.org>wrote;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
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