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st: RE: Graphs and number of observations


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Graphs and number of observations
Date   Thu, 10 Apr 2008 18:39:23 +0100

In principle you count the number of observations and then put it
somewhere: 

. sysuse auto
(1978 Automobile Data)

. count if foreign
   22

. histogram mpg if foreign, subtitle(`r(N)' observations)
(bin=4, start=14, width=6.75)

However, watch out for missings. A more careful count is 

. count if mpg < . & foreign 

as the -histogram- will not show missings. 

See also the -goldbar- code posted yesterday in reply to Richard
Goldstein for some technique. 

Nick
n.j.cox@durham.ac.uk 

Herve STOLOWY

I am starting to use graphs. So, I hope that you will forgive my
probably basic question. 

I run the following command:

histogram ib_scaled_w if ib_scaled_w >-.1 & ib_scaled_w<.1 &
country=="AUS"  & sample_sum==1, bin(20) by(post_ifrs) title("AUS")
saving (hist_AUS, replace)

post_ifrs is a binary variable (coded 0 or 1).

Is there a way to display the total number of observations corresponding
to each of the histograms obtained with the command? (one graph with
post_ifrs = 0 and one graph with post_ifrs=1)

I searched in the Graphics Stata manual but did not find the solution. 

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