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Re: Entering '<1' and 'BDL'

From: Rich Shepard <rshepard(at)appl-ecosys(dot)com>
To: "pdxpug(at)postgresql(dot)org" <pdxpug(at)postgresql(dot)org>
Subject: Re: Entering '<1' and 'BDL'
Date: 2010-04-20 19:38:31
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Lists: pdxpug
On Tue, 20 Apr 2010, Rich Shepard wrote:

>  The database we're building uses floating point numbers, where
> appropriate. Spreadsheets use whatever someone wants to put in a cell. I
> need to look at how NAN is expressed.

   However, this does raise a question that I need to answer: how to
distinguish between a sample taken, analyzed, and with a value below
detection limits and a sample not taken. There may be legitimate reasons for
not taking a sample, or it might have been missed inadvertently. Or, the
sameple might have been taken and analyzed but the results not entered in
the system.

   We need to ponder this.


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