Last week there was a thread on outlier detection.
I came across an article which has a very interesting paragraph.
The article is
Missing Values, Outliers, Robust Statistics, & Non-parametric Methods
by Shaun Burke, RHM Techology Ltd, High Wycombe, Buckinghamshire, UK.
It was the fourth article in a series which appeared in
Scientific Data Management
in 1998 and 1998.
The very interesting paragraph is this:
NB: It should be noted that following a
judgement in a US court, the Food and
Drug Administration 9FDA) in a guide -
Guide to inspection of pharmaceutical
quality control laboratories - has
specifically prohibited the use of outlier
tests.
Elsewhere, the article recommends the use of outlier tests as a way of
locating possible transcription errors, but NOT as a way of discarding data.
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