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last missing visits imputed with locf (the baseline is not carrried forward)

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last missing visits imputed with locf (the baseline is not carrried forward)

Hi everyone, I got the next dataset:

The idea is  imputed only the missing value of the last visits with LOCF, the missing intermediate visits remaining missing, and the carried baseline (i.e week2) if it is missing remaining missing.

In Bold face I show the visits need to be imputed with LOCF

data new;

input subjid week value;

datalines;

1  Baseline 10

1 Week2   12

1 week8  14

1 week12 16

2 baseline 12

2 week2   4

2 week8  14

3 Baseline 13

3 week4  5

3 week12   2

4 baseline 1

4 week2   3

5 Baseline 3

5 Week2  5

5 week12 6

run;

and I am looking for the want dataset:

1  Baseline 10

1 Week2   12

1 week8  14

1 week12 16

2 baseline 12

2 week2   4

2 week8  14

2 week12 14

3 Baseline 13

3 week4  5

3 week12   2

4 baseline 1

4 week2   3

4 week4   3

4 week8  3

4 week12 3


5 Baseline 3

5 Week2  5

5 week12 6



I hope you can help me.

Thnaks.

V.

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