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st: -trimmean- and -trimplot- revised on SSC

From   Nick Cox <>
To   "" <>
Subject   st: -trimmean- and -trimplot- revised on SSC
Date   Tue, 14 May 2013 10:06:16 +0100

Thanks as ever to Kit Baum, packages -trimmean- and -trimplot- have
been revised on SSC. These were posted earlier in 2013 and are now
much revised and extended. -trimmean- requires Stata 9 and -trimplot-
requires Stata 8.2.

(In the unlikely event that you use Stata 8 and previously downloaded
-trimmean-, sorry, but this update is of no use to you.)

-trimmean- now allows trimmed means given percent or number trimmed or
maximum allowed deviation. The last is trimmed means defined as the
mean of all values satisfying

|value - median| <= deviation.

Confidence intervals are now supported for trimmed means defined by
percent or number trimmed.

The help file is very detailed and represents a draft of a paper in
That is on-going: for example, only yesterday I remembered that
Mosteller, F. and Tukey, J.W. 1977 Data analysis and regression.
Reading, MA: Addison-Wesley deserves a reference.

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