Introduction to Stata 8 - (GRIPS

twoway dropline
20
Patient number
15
10
5
1
Deaths
Censorings
0 1 2 3 4 5 6 7
Years after diagnosis
// c:\dokumenter\...\gph.obstime.do
use "c:\dokumenter\...\cohort1.dta" , clear
list patient time died in 1/5 , clean
patient time died
1. 1 0.578 1
2. 2 0.867 1
3. 3 1.235 1
4. 4 1.374 0
5. 5 1.437 1
set scheme lean2
twoway ///
(dropline time patient if died==1, horizontal msymbol(S)) ///
(dropline time patient if died==0, horizontal ///
msymbol(S) mfcolor(white)) ///
, ///
plotregion(margin(zero)) ///
ytitle("Patient number") ///
yscale(range(0 22)) ///
ylabel(1 5 10 15 20 , nogrid) ///
xtitle("Years after diagnosis") ///
xlabel(0(1)7) ///
legend(label(1 "Deaths") label(2 "Censorings") ring(0)) ///
xsize(3.7) ysize(2.5) scale(1.3)
In a dropline plot a line 'drops' from a marker perpendicularly to the x- or y-axis. Droplines
technically are bar outlines, like range plots, and their appearance is controlled by
blpattern(), blcolor() and blwidth().
The marker for censorings is a square with white fill, not a hollow square, to avoid the
dropline to be visible within the marker.
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