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st: -if- and r() in -histogram-


From   Antoine Terracol <Antoine.Terracol@univ-paris1.fr>
To   statalist@hsphsun2.harvard.edu
Subject   st: -if- and r() in -histogram-
Date   Thu, 04 Feb 2010 13:19:14 +0100

Dear _all,

I am puzzled by the fact that -histogram- does not seem to properly select cases based on a comparison with a saved result after -summarize-:

/**********************/
clear
cap graph drop _all
set obs 1000
g x=exp(rnormal())
su x, de
local p95=r(p95)
di r(p95)
hist x if x<r(p95), name(ha)
hist x if x<`p95', name(hb)
hist x, name(hc)
/**********************/

the first histogram (with the -if- statement and the reference to r(p95)) is identical to the last histogram (without the -if- statement). When r(p95) is saved to a local macro which is then used in an -if- statement, it works fine (second graph).

Now, I have not tried all types of graphs, but -kdensity- seems to behave as expected:

/**********************/
clear
cap graph drop _all
set obs 1000
g x=exp(rnormal())
su x, de
local p95=r(p95)
di r(p95)
hist x if x<r(p95), name(ka)
hist x if x<`p95', name(kb)
hist x, name(kc)
/************************/



Best,
Antoine

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