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RE: st: Precision and ordering issue in histograms titles


From   "MA V" <[email protected]>
To   [email protected]
Subject   RE: st: Precision and ordering issue in histograms titles
Date   Wed, 24 Jan 2007 23:47:58 +0000

Svend replied:

This is a precision problem. Try to declare X double precision:

sysuse auto
gen double X=0.8-foreign
twoway histogram mpg , by(X)
-------------------------------------------------

Unfortunately in my case this does not seem to work...
Suppose you do

sysuse auto, clear
gen X=0.8-foreign
gen double X1=X
twoway histogram mpg , by(X1)

this still gives histograms with not so pretty titles...

How can I create histograms by X, with nice titles, and without losing the order of the histograms?

Thanks,
MA


____________________________________________________________
Original post:

Hi--
I am trying to plot several histograms in one plot using:
twoway histogram mpg, by(X)

My question is the following: My X variable is numeric, so I am having some precision issues with the titles of the individual histograms. For example, if X=-0.2 the title for the corresponding histogram will come out as being "-0.2000000029802322" which is not a very pretty title... So, after reading some of the previous posts on the precision issues in Stata I concluded that one way to achieve nice titles would be to create a string variable, i.e. gen Xstring=string(X). Now the titles of the plot come out fine when I replace <by(X)> with <by(Xstring)>. The only problem is that the plots do not come out ordered by X (i.e. from the smallest X to the largest X) anymore...
Is there any way of getting around the precision issue without losing the ordering of the histograms?
Thanks for your help.
Best.
MA

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