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...s, etc. Do people on this list have similar scripts for R? How are such scripts included and would people be willing to share them? Whenever I create variables, I try to think of different ways to check whether things went properly. In Stata, the "assert" command evaluates a logical condiation over all records. Is there a similar facility or scripts (for different contexts) for R? Thanks very much for this discussion. I will post two other messages focusing on particular tasks. Best. - PB Patrick Ball, PhD. Deputy Director AAAS Science and Human Rights Program http://shr.aaas...