# RE: st: Precision and ordering issue in histograms titles

 From "Nick Cox" <[email protected]> To <[email protected]> Subject RE: st: Precision and ordering issue in histograms titles Date Thu, 25 Jan 2007 00:14:58 -0000

```Another is to use value labels. Suppose you have
groups of some variable that are 0.1, 0.2, 0.3, 0.4,
0.5.

We can mimic this with the auto data.

. gen rep782 = rep78 / 10
(5 missing values generated)

Now map the distinct values to integers 1 ... 5 and
label:

. egen group = group(rep782), label
(5 missing values generated)

. tab group

group(rep78 |
2) |      Freq.     Percent        Cum.
------------+-----------------------------------
.1 |          2        2.90        2.90
.2 |          8       11.59       14.49
.3 |         30       43.48       57.97
.4 |         18       26.09       84.06
.5 |         11       15.94      100.00
------------+-----------------------------------
Total |         69      100.00

If you don't like the labels, fix them manually:

. label def  group 1 "0.1" 2 "0.2" 3 "0.3" 4 "0.4" 5 "0.5" , modify

. tab group

group(rep78 |
2) |      Freq.     Percent        Cum.
------------+-----------------------------------
0.1 |          2        2.90        2.90
0.2 |          8       11.59       14.49
0.3 |         30       43.48       57.97
0.4 |         18       26.09       84.06
0.5 |         11       15.94      100.00
------------+-----------------------------------
Total |         69      100.00

Now a histogram:

. histogram mpg, by(group)

Nick
[email protected]

Nick Cox

>
> . gen SX1 = string(X1, "%02.1f")
>
> . twoway histogram mpg, by(SX1)

MA V

> > 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?

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```