Question 1

While performing data validation checks, you are tasked with writing a SAS program that will identify all subjects who have a discrepancy in their record: the variable 'EndDate' is before the 'StartDate'. Which programming technique would be best suited to identify these subjects?

Options :

A : A DATA step with a WHERE statement to subset records where 'EndDate' < 'StartDate'.

B : A DATA step with an IF-THEN statement to flag records where 'EndDate' < 'StartDate'.

C : PROC COMPARE to compare 'StartDate' and 'EndDate' for each subject.

D : PROC FREQ to calculate frequencies of 'EndDate' and 'StartDate'.

Answer: B

Question 2

During the execution of a SAS program, the programmer wants not only to display each step generated by macro execution but also to show the values of macro variables at execution time. Which combination of system options should the programmer use?

Options :

A : MPRINT and SYMBOLGEN

B : MLOGIC and SYMBOLGEN

C : MPRINT and MLOGIC

D : SYMBOLGEN and MACROGEN

Answer: A

Question 3

A clinical trial analyst needs to create a Kaplan-Meier survival plot to visualize the time-to-event data for different treatment groups. Which PROC step should the analyst use, and what is the key statement to differentiate the treatment groups in the graph?

Options :

A : PROC GPLOT with a BY statement

B : PROC LIFETEST with a STRATA statement

C : PROC SGPLOT with a SERIES statement

D : PROC PHREG with a CLASS statement

Answer: B

Question 4

A clinical trial dataset contains the variable 'BloodPressure' measured at multiple time points for patients. You are interested in analyzing the distribution and central tendency of baseline blood pressure levels across all patients. Which SAS procedure would you use to generate descriptive statistics including the mean, median, standard deviation, and quartiles for the baseline 'BloodPressure' measurements?

Options :

A : PROC FREQ

B : PROC SUMMARY

C : PROC UNIVARIATE

D : PROC MEANS

Answer: C

Question 5

A clinical trial programmer needs to generate a report listing all datasets in the WORK library that were created today. Which of the following SQL queries correctly retrieves this information from the appropriate DICTIONARY table or view?

Options :

A : proc sql; select * from dictionary.tables where libname='WORK' and crdate=today(); quit;

B : proc sql; select * from sashelp.vtable where libname='WORK' and created=today(); quit;

C : proc sql; select memname from sashelp.vtable where libname='WORK' and modate=today(); quit;

D : proc sql; select name from dictionary.tables where libname='WORK' and datecreated=today(); quit;

Answer: B

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