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POHandling string variables inside collapse command
 

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    <p>Edit: I should have generated better data. It isn't necessarily the case that the string variable is <code>destring</code>able. I'm just being lazy here (I don't know how to generate random letters).</p> <hr> <p>I have a data set with a lot of strings that I want to <code>collapse</code>, but it seems that in general <code>collapse</code> doesn't place nicely with strings, particularly <code>(firstnm)</code> and <code>(count)</code>. Here are some similar data.</p> <pre><code>clear set obs 9 generate mark = . replace mark = 1 in 1 replace mark = 2 in 6 generate name = "" generate random = "" local i = 0 foreach first in Tom Dick Harry { foreach last in Smith Jones Jackson { local ++i replace name = "`first' `last'" in `i' replace random = string(runiform()) } } </code></pre> <p>I want to <code>collapse</code> on "mark", which is simple enough with <code>replace</code> and subscripts.</p> <pre><code>replace mark = mark[_n - 1] if missing(mark) </code></pre> <p>But my <code>collapse</code>s fail with <code>type mismatch</code> errors.</p> <pre><code>collapse (firstnm) name (count) random, by(mark) </code></pre> <p>If I use <code>(first)</code>, then the first error clears, but <code>(count)</code> still fails. Is there a solution that avoids an additional <code>by</code> operation?</p> <p>It seems that the following works, but would also be a lot more time-consuming for my data.</p> <pre><code>generate nonmissing_random = !missing(random) egen nonmissing_random_count = count(nonmissing_random), by(mark) collapse (first) name nonmissing_random_count, by(mark) </code></pre> <p>Or is any solution that facilitates using <code>collapse</code> the same?</p>
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