topic Re: KM plot. use vertical line as symbol in Graphics Programming

KM plot. use vertical line as symbol

Adie_efc — Tue, 22 Jul 2014 15:50:45 GMT

as is traditional in a KM plot (step plot) the symbol for a censored value is a ¦ (vertical line). every example Ive seen in GTL uses a symbol of plus as there doesnt seem to be an appropriate symbol and unlike old versions I cant use a capital i. My example below uses a + too and it doesnt look quite right.

stepplot x=_x y=_surv / group=signvar lineattrs=(pattern=solid) name='s';

scatterplot x=_x y=_cens / markerattrs=(symbol=plus) GROUP=signvar ;

Re: KM plot. use vertical line as symbol

Jay54 — Tue, 22 Jul 2014 16:02:26 GMT

You have two option. With SAS 9.4M1, you can use any character from a font as a symbol using the SYMBOLCHAR statement. With Unicode fonts, your choices are huge. Pre SAS 9.4M1, you can use the SCATTERPLOT with MARKERCHARACTER option to draw the vertical bar "|" at each location.

Re: KM plot. use vertical line as symbol

Haikuo — Wed, 23 Jul 2014 03:02:26 GMT

Sanjay,

Thank you for coming and the autograph. Great talk in BUG. Hope you had a pleasant trip!

Haikuo

Re: KM plot. use vertical line as symbol

Adie_efc — Wed, 23 Jul 2014 08:13:12 GMT

Hi Sanjay

Im using 9.3 and using the scatterplot/markerchar. however it doesnt give me the option to use a vertical bar "|", only the ones in the standard ones.

unless Im doing something wrong with my scatter?

scatterplot x=_x y=_cens / markerattrs=(symbol=plus) GROUP=signvar ;

Thanks

Adie

Re: KM plot. use vertical line as symbol

Adie_efc — Wed, 23 Jul 2014 12:07:32 GMT

after all this...my boss has changed his mind and the "plus" is now acceptable!

Thanks anyway!

Re: KM plot. use vertical line as symbol

Jay54 — Wed, 23 Jul 2014 13:02:19 GMT

OK. But if you still need to do something similar later, here is what you do. First, add a new column (censor) to your data and populate it with the character(s) you want to display in the graph.. In this case, put a "|" where ever you want the display the censor observation. Then use the scatterplot with same X and Y variables and the option markercharacter=censor. Keep the length of this variable (or format) as small as possible to avoid any leading blanks.

Re: KM plot. use vertical line as symbol

Jay54 — Wed, 23 Jul 2014 13:03:25 GMT

It was my pleasure meeting all the BUGS attendees.