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I'm probably missing something obvious, but what's the function to return the number of obsevations in each cross-section in an unbalanced panel?

If you want to link them up to the original observation, use @obsby, as in To get the results in a simple vector, you can just grab the first observation in each cross-section and use stom to extract the values The relational database way of doing this is to create a cross-section only page and linking from the original page, but the above is probably enough for what you want to do.

While the above isn't so bad, what we should do to make this easier is to allow you to output the results from the one-way tabulation into a matrix.

Thanks Glenn, that's what I needed.