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
> One answer is to be found in a concurrent thread:
>
> . 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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