20 Feb
2008
20 Feb
'08
9:27 a.m.
Hello Marcus,
The identification vars are removed from the dataset before the
algorithm is run and returned to their rightful columns once the
algorithm has finished. Thus, (b) is the correct answer. You would get
the same results from Amelia if you sent it your data with those ID
columns removed.
good luck,
matt.
On Feb 20, 2008 9:23 AM, Marcus M. Dapp <mdapp(a)ethz.ch> wrote:
Hello
The manual says about identification variables: "idvars : a vector of
column numbers or column names that indicates identification variables.
These will be dropped from the analysis but copied into the imputed
datasets."
The "dropping" is not 100% clear to me in an important aspect, namely,
whether idvars are -considered- in the MI calculation process at all. So
is a) or b) the correct answer?
a) The idvars are -used- in the MI process to calculate imputations, but
are themselves not modified (imputed). They are copied to the output
dataset 1:1.
b) The idvars are only copied and -not- (even) considered in the MI
process to calculate imputations.
Thank you,
Marcus
--
Marcus M. Dapp | PhD student | ETH Zurich | www.ib.ethz.ch/people/mdapp
Prof. Thomas Bernauer, International Relations | www.ib.ethz.ch
On the shoulders of giants? http://science.creativecommons.org
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