[Rd] meaning of "trim" in mean()

From: Liaw, Andy <andy_liaw_at_merck.com>
Date: Thu, 25 Oct 2007 09:04:53 -0400


(I see this in both R-patched r43124 and R-devel r43233.) In the Argument section of ?mean:

trim the fraction (0 to 0.5) of observations to be trimmed from each end of x before the mean is computed. Values outside that range are taken as the nearest endpoint.

Then in the Value section:

If trim is non-zero, a symmetrically trimmed mean is computed with a fraction of trim observations deleted from each end before the mean is computed.

The description in "trim" to me sounds like Windsorizing, rather than trimming. Should that be edited?

Best,
Andy

Andy Liaw, PhD
Biometrics Research PO Box 2000 RY33-300

Merck Research Labs        Rahway, NJ 07065
andy_liaw(a)merck.com          732-594-0820



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