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Old 16-06-2014, 06:49 PM
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RickS (Rick)
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RickS is offline
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
Originally Posted by LightningNZ View Post
Rick, do you have a link or some stats to back this up? 20% is a big amount. While I can see that mean with sigma rejection should be superior, I find the 20% value a little hard to fathom.

For instance in my example above, leaving out the bottom two values of 0 (obvious outliers) would result in a mean of 13876.125 - not much different at all from the median value.

Using the median effectively ignores much of the data so I don't find it difficult to understand intuitively. One of the more complete analyses I've seen is in the PI doc:

See the section on median combination.

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