This question will ask you to provide lines of missing code. Given the following SCORE data set: ``` subject visitin visit score 001 0 Week 0 151 001 1 Week 2 150 001 2 Week 4 . 001 3 Week 6 157 001 4 Week 8 155 001 5 Week 10 . 001 6 Week 12 . 001 7 Followup 152 ``` The following SAS program is submitted: ```sas data LOCF; set score; by subject visitin ; run; ``` Resulting in this LOCF data set: ``` subject visitin visit score LOCF 001 0 Week 0 151 151 001 1 Week 2 150 150 001 2 Week 4 . 150 001 3 Week 6 157 157 001 4 Week 8 155 155 001 5 Week 10 . 155 001 6 Week 12 . 155 001 7 Followup 152 152 ``` Variable LOCF contains the imputed score that would replace the missing SCORE value (based on last observation carried forward method). Which SAS statements complete the program?

Question

This question will ask you to provide lines of missing code. Given the following SCORE data set:

```
subject visitin visit score
001 0 Week 0 151
001 1 Week 2 150
001 2 Week 4 .
001 3 Week 6 157
001 4 Week 8 155
001 5 Week 10 .
001 6 Week 12 .
001 7 Followup 152
```

The following SAS program is submitted:

```sas
data LOCF;
 set score;
 by subject visitin ;
 <insert code here>
run;
```

Resulting in this LOCF data set:

```
subject visitin visit score LOCF
001 0 Week 0 151 151
001 1 Week 2 150 150
001 2 Week 4 . 150
001 3 Week 6 157 157
001 4 Week 8 155 155
001 5 Week 10 . 155
001 6 Week 12 . 155
001 7 Followup 152 152
```

Variable LOCF contains the imputed score that would replace the missing SCORE value (based on last observation carried forward method). Which SAS statements complete the program?

Accepted Answer

C. retain LOCF ;
if first.subject then LOCF = .;
if score = . then LOCF = score ;

Answer

A. LOCF = lag(score);
if first.subject then LOCF = .;
if score = . then LOCF = score ;

Answer

B. if first.subject then LOCF = .;
if score = . then LOCF = lag(score);

Answer

D. retain score ;
if first.subject then LOCF = .;
if score = . then LOCF = score ;

A00-280 Question #67: Real Exam Question with Answer & Explanation

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