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SASInstitute Clinical Trials Programming Using SAS 9.4 Sample Questions:

1. What is the primary purpose for specifying identifier variables across SDTM domains?

A) To uniquely reference each record
B) To include the appropriate study information
C) To include the appropriate subject information
D) To satisfy regulatory conditions

2. Given the following code executed with system date and time of April 29, 2020 at 10:33 AM:
data _null_;
daytim=put("&sysdate"d,date9.)||" "||put("&systime"t,time8.);
call symputx("nowdate", daytim);
run;
%put &nowdate;
The output of the macro variable "nowdate" in the log will be:

A) daytim
B) 29APR2020 10:33:00
C) &nowdate
D) 29APR2020 10:33 AM

3. The print below shows the first four observations from the TEST2 dataset.
Variable names are given in the first row.

The statistical analysis plan (SAP) requests that a two sample t-test be performed to compare the mean of variable FINALBP for levels of the variable TRT.
You review the following code from a colleague:
proc ttest data=test2;
by trt;
var finalbp;
run;
This code does not produce the analysis requested by the SAP.
What is wrong with this code?

A) Variable TRT should be specified on a WEIGHT statement instead of a BY statement.
B) Variable FINALBP should be specified on a TWOSAMP statement instead of a VAR statement.
C) Variable TRT should be specified on a CLASS statement instead of a BY statement.
D) Variable FINALBP should be specified on a TEST statement instead of a VAR statement.

4. The PROC COMPARE code below is intended to validate the results from a PROC FREQ.
Both the ProdFreqData and ValFreqData data sets contain 10 observations of the variable Frequency.
No other variables are present in these data sets.
proc compare base = ProdFreqData
comp = ValFreqData
out = FreqDiffs
outbase outcomp outdif outnoeq
method = exact
noprint;
run;
After successfully executing this PROC COMPARE step, what is a possible reason for the FreqDiffs file to contain 30 records?

A) The formatted values of Frequency are different in the base and comparison data sets.
B) The variable types of Frequency are different in the base and comparison data sets.
C) The internal values of Frequency are different in the base and comparison data sets.
D) The variable labels of Frequency are different in the base and comparison data sets.

5. A subject visit data set (Visits) includes variables for subject ID (SubjID) and visit date (VisitDT).
Which DATA step creates a data set with one record per subject and creates a variable (Visits) that computes the total number of visits for that subject?

A) proc sort data=Visits out=SortVisits;
by SubjID;
run;
data VisitCount;
set SortVisits;
by SubjID;
if first.SubjID then Visits=0;
Visits+1;
if last.SubjID then output;
keep SubjID Visits;
run;
B) proc sort data=Visits out=SortVisits;
by SubjID VisitDT;
run;
data VisitCount;
set SortVisits;
by SubjID VisitDT;
if first.SubjID then Visits=0;
else if last.SubjID then output;
else Visits+1;
keep SubjID Visits;
run;
C) proc sort data=Visits out=SortVisits;
by SubjID VisitDT;
run;
data VisitCount;
set SortVisits;
by SubjID VisitDT;
if first.SubjID then Visits=0;
else if last.SubjID then output;
Visits+1;
keep SubjID Visits;
run;
D) proc sort data=Visits out=SortVisits;
by SubjID VisitDT;
run;
data VisitCount;
set SortVisits;
by SubjID VisitDT;
if first.SubjID then Visits=0;
if last.SubjID then output;
Visits+1;
keep SubjID Visits;
run;

Solutions: