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re: st: Stata chi-squared ptrendi command
From
"Airey, David C" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
re: st: Stata chi-squared ptrendi command
Date
Fri, 22 Apr 2011 12:10:24 -0500
.
Maybe you need to install it from SSC?
. ssc describe ptrend
--------------------------------------------------------------------------------
package ptrend from http://fmwww.bc.edu/repec/bocode/p
--------------------------------------------------------------------------------
TITLE
'PTREND': module for trend analysis for proportions
DESCRIPTION/AUTHOR(S)
ptrend calculates a chi-square statistic for the trend
(regression) of pvar on xvar, where pvar is the proportion
rvar/(rvar+nrvar). A variable called _prop, containing the values
of pvar, is left behind by ptrend. ptrend also gives a
chi-square test for departure from the trend line. ptrendi does
the same analysis on user-entered data; the proportions are now
p1 = r1/(r1+nr1), p2 = r2/(r2+nr2), etc.
Distribution-Date: 20020605
Author: Patrick Royston, MRC Clinical Trials Unit, UK
Support: email [email protected]
INSTALLATION FILES (type net install ptrend)
ptrend.ado
ptrend.hlp
ptrendi.ado
ptrendi.hlp
--------------------------------------------------------------------------------
(type -ssc install ptrend- to install)
. which ptrend
command ptrend not found as either built-in or ado-file
r(111);
*
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