New functions is_missing and get_val
authorJohn Darrington <john@darrington.wattle.id.au>
Sat, 24 Oct 2009 07:02:54 +0000 (09:02 +0200)
committerJohn Darrington <john@darrington.wattle.id.au>
Sat, 24 Oct 2009 08:00:02 +0000 (10:00 +0200)
Abstract the actions of obtaining the numeric value of a variable
and its missing status, so that it can be more easily applied to
categorical variables and linear variables alike.


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