On Fri, 8 Jan 1999, ATKINSON MICHAEL wrote:
> I have a series of lists of between 25 and 150 records each with a
> distance field from a known point. (these are distances of properties
> from a linear feature centrepoint).
<snip>
> I wish to identify any records that are likely to be errors, the
> criteria for an error is that they form outliers in this group of
> values.
Mike,
Before you can answer that question you need to consider what the data
represent, how large location measurement errors may be, what significance
the numbers have relative to the data items and how the resulting
distribution will be used.
For example, "outlier" wetland vegetation in a field is determined
differently from "outlier" water chemistry values in a river.
If you can supply us with more detail we may be able to help you.
Rich
Dr. Richard B. Shepard, President
Applied Ecosystem Services, Inc.
2404 SW 22nd Street
Troutdale, OR 97060-1247 U.S.A.
+ 1 503-667-4517 (voice) | + 1 503-667-8863 (fax)
[EMAIL PROTECTED]
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