topic Display BY group names in survival plots in PROC LIFETEST in Statistical Procedures

Display BY group names in survival plots in PROC LIFETEST

EricCai — Tue, 28 Oct 2014 00:24:12 GMT

Dear Community,

My data set has an indicator variable named "BY_GROUPS" that shows the names of 2 groups: A and B. I need to plot 2 different survival functions in PROC LIFETEST based on these 2 groups. (Note that I am NOT trying to plot the 2 groups as 2 strata on the same survival plot.)

I can do this by running PROC LIFETEST with the BY statement. However, I can't figure out how to display the names "A" and "B" in the plot. The documentation and online resources don't reveal an answer.

Could you please help?

My sample code is below.

Thanks,

Eric

_________________________________________________________________________________

PROC LIFETEST

data = my_survival_data

method = KM

notable

plots = survival

(

atrisk

);

time survival_time * censor_variable(1);

strata strata_group;

by BY_GROUP;

run;

Re: Display BY group names in survival plots in PROC LIFETEST

Reeza — Tue, 28 Oct 2014 02:55:43 GMT

What version of SAS are you on?

I know you can definitely do it by modifying the templates, if you have SAS 9.4 you may have an odstitle option but I'm not sure.

Here's instructions on how to modify the title by modifying the template.

SAS/STAT(R) 9.2 User's Guide, Second Edition

Re: Display BY group names in survival plots in PROC LIFETEST

EricCai — Mon, 10 Nov 2014 20:08:13 GMT

Hi Reeza,

I have SAS 9.3.

I found a simple solution. Instead of using the "BY" statement in PROC LIFETEST to get the plots for the 2 groups, I used 2 separate PROC LIFETEST procedures to get the 2 plots. I was then able to specify the group in my "TITLE" statements. I used the "WHERE =" option to select the group that I wanted after specifying the data.

It's not very elegant, but it works.

PROC LIFETEST

data = my_survival_data

(

where = (

group = 'A'

)

method = KM

notable

plots = survival

(

atrisk

);

time survival_time * censor_variable(1);

strata strata_group;

title 'Survival Plot for Group A';

run;

PROC LIFETEST

data = my_survival_data

(

where = (

group = 'B'

)

method = KM

notable

plots = survival

(

atrisk

);

time survival_time * censor_variable(1);

strata strata_group;

title 'Survival Plot for Group B';

run;

Re: Display BY group names in survival plots in PROC LIFETEST

Reeza — Tue, 11 Nov 2014 18:52:01 GMT

I assumed you were trying to change the default title. If title statements work try using the #byval(group) instead.

PROC LIFETEST

data = my_survival_data

method = KM

notable

plots = survival

(

atrisk

);

by group

time survival_time * censor_variable(1);

strata strata_group;

title 'Survival Plot for Group #byval(group)';

run;