st: number of missing variables per observation for string variables

[Alison El Ayadi <aelayadi@gmail.com>]

Dear Statalist -

I am trying to generate the number of missing variables per
observation among a series of string variables.

I thought that the rmiss2 extension to egen function would perform
this with no problem. However, when I run the following code:

egen nmis=rmiss2(q1-q94)

I get an error: float not allowed r(101).  These are all string
variables, so I don't understand why this is not working.  Does anyone
know how to write this differently or accomplish my goal in a
different way?

Thanks so much,
Alison
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