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SASInstitute Clinical Trials Programming Using SAS 9.4 Sample Questions:
1. The following question will ask you to provide a line of missing code. The following program is submitted to output observations from data set ONE that have more than one record per patient.
Please enter the line of code that will correctly complete the program. Note: Case is ignored. Do not add leading or trailing spaces to your answer.
A) BYSUBJID;
run;
B) BYSUBJID;
BYSUBJID;
C) id;
PTON run;
D) BYSUBJID;
2. Which statement assigns the system date and time to the character variable CURRDTTM?
A) currdttm='&sysdate9 &systime';
B) currdttm='%sysdate9 %systime';
C) currdttm="%sysdate9 %systime";
D) currdttm="&sysdate9 &systime";
3. Which statement correctly describes an aspect of a Phase II clinical trial?
A) designed to assess how well the drug works
B) designed to assess the pharmacovigilance, pharmacokinetics, and pharmacodynamics of a drug
C) randomized controlled multicenter trials on large patient groups
D) in vitro and in vivo experiments using wide-ranging doses of the drug
4. The following SAS program is submitted:
proc sort data=SASUSER.VISIT out=PSORT; by code descending date cost; run; Which statement is true regarding the submitted program?
A) The PSORT data set is stored in the SASUSER library.
B) The descending option applies to the variable CODE.
C) The descending option applies to the DATE and COST variables.
D) The variable CODE is sorted by ascending order.
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 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;
B) 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;
C) 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;
D) 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;
Solutions:
Question # 1 Answer: D | Question # 2 Answer: D | Question # 3 Answer: A | Question # 4 Answer: D | Question # 5 Answer: B |