Hi All,
I am doing a cluster analysis with a dataset that is sparse in a subset of variables. I'm against the standard techniques - modeling the missing values, or replacing them with the mean - for theoretical reasons.
A google search turned up a paper about using soft constraints - essentially using the sparse variables when they exist - and I'm wondering if there is a package/routine in Stata that implements this (or a similar) technique.
The paper is available at:
http://www.litech.org/~wkiri/Papers/wagstaff-missing-ifcs04.pdf
Thanks,
Dan
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