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Re: st: generate variable versus define scalar, with conditional statement


From   "Seed, Paul" <paul.seed@kcl.ac.uk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: generate variable versus define scalar, with conditional statement
Date   Thu, 17 Jan 2013 10:02:46 +0000

Just realised I had a typo:
It should be r(N), not r(n).

The correct version is:

 	clear all
 	sysuse sp500

	summ  open if date == mdy(1,2,2001), meanonly
 /// the meanonly option suppresses output, and saves computer time
 ///by not calculating the standard deviation.  It is not essential.
 	scalar newscalar_mean = r(mean)
 	scalar newscalar_min= r(min)
 	scalar newscalar_max= r(max)
 	if r(N) == 1 scalar newscalar = r(mean)
	else scalar newscalar = .

/// And to check it: 
	summ  open if date == mdy(1,2,2001)
	scalar list

/// and with repeats
	summ  open if _n < 10, meanonly
 /// the meanonly option suppresses output, and saves computer time
 ///by not calculating the standard deviation.  It is not essential.
 	scalar newscalar_mean = r(mean)
 	scalar newscalar_min= r(min)
 	scalar newscalar_max= r(max)
 	if r(N) == 1 scalar newscalar = r(mean)
	else scalar newscalar = .

/// And to check it: 
	summ  open if _n < 10
	scalar list


Paul T Seed, Senior Lecturer in Medical Statistics, 
Division of Women's Health, King's College London
Women's Health Academic Centre, King's Health Partners 
(+44) (0) 20 7188 3642.



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