SAS code and format? DATA=final.cocaine_relapse

PROC SQL; SELECT COUNT(*) AS AtRiskWeek6 FROM final.cocaine_relapse WHERE week = 6; QUIT;

PROC LIFETEST DATA=final.cocaine_relapse METHOD=KM; TIME week*relapse(0); RUN;

/* Print the first few rows of the data */ PROC PRINT DATA=final.cocaine_relapse (OBS=5); RUN;

/* Construct a life table using PROC LIFETEST */ PROC LIFETEST DATA=final.cocaine_relapse METHOD=KM PLOTS=(S) TIME=week*relapse(0) OUTSURV=work.lifetable; RUN;

/* Print the life table */ PROC PRINT DATA=final.lifetable; RUN;

/* Calculate the number of individuals at risk, relapsed, and censored at week 6 */ DATA week6; SET final.cocaine_relapse; IF week = 6 THEN OUTPUT; RUN;

PROC FREQ DATA=week6; TABLES relapse / OUT=FreqOut; RUN;

PROC PRINT DATA=FreqOut; RUN;

/* Calculate the proportion of individuals relapsed at week 6 */ PROC MEANS DATA=week6 MEAN; VAR relapse; RUN;

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