For a scientific database holding observed and measured values there are
two non-numeric (NAN) legitimate entries: <1 and 'below detection limits.'
Is anyone aware of a standard way of expressing these?
The problem is that the column needs to be of a numeric type because the
numbers will be manipulated mathematically and summarized statistically. So
a NAN such as '<1' or 'BDL' doesn't cut it.
Richard B. Shepard, Ph.D. | Integrity Credibility
Applied Ecosystem Services, Inc. | Innovation
<http://www.appl-ecosys.com> Voice: 503-667-4517 Fax: 503-667-8863
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