[no subject]

I know there is a long way around this problem, but it seems like such a simple
task that I suspect there is a quicker way.

Many thanks
Mark Clatworthy
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/