topic Re: How to convert time variable in days into 12 Months for a Kaplan-Meier Plot in SAS Programming

How to convert time variable in days into 12 Months for a Kaplan-Meier Plot

Denali — Sat, 19 Sep 2020 19:26:15 GMT

Hi,

I would like to make a Kaplan-Meier curve using Proc lifetest.

I have a time variable, which was calculated from the interval between two dates. Currently, the unit is in days. How do I covert the the days iinto months so that I can plot the graph with 1-12 months on the X-axis?

Thank you!

Re: How to convert time variable in days into 12 Months for a Kaplan-Meier Plot

Shmuel — Sat, 19 Sep 2020 20:35:04 GMT

Suppose you know the initial date or maybe is part of the data you can calculate the 12

dates by next code:

/* date1 is the initial date */

do m = 1 to 12;
   date = intnx('month',date1,m);
   putlog m= date= date9.;
end;

Having a sample of your data and posting the wanted output, it will enable to give you more

precise code.

Re: How to convert time variable in days into 12 Months for a Kaplan-Meier Plot

PGStats — Sat, 19 Sep 2020 21:12:47 GMT

Simply associate the format MONTH3. with your time (days) variable.