Hi,
I'm working with long format data from an educational psychology study.
I have the following setup:
Multiple observations per ID, each with a 'status' variable and a 'date' variable.
For example:
To give some background, this entire sample of children are considered remedial. We preform some intervention and then follow them up with assessments at different times to see if they can qualify for a switch to advance studies from remedial. This is what the bulk of my data is, those 'assessment's.
What I'm interested in is extracting the first time a student was able to switch from a remedial (assumed to be default) to an advance program. So in essence, I need to extract the first occurrence of status = 'advance' for each student. For those who never switch into advance (that remain remedial) I'd like to just extract the date of their last assessment.
I've tried using the retain statement to no luck. I've been able to transpose the data using proc transpose + arrays to search for the first occurrence of the 'Advance', but I'm not sure how to code the part for students who never get to advance (i.e, pure remedial) because remember I do need their last date of assessment for these kids. For this approach I was using a "do until" loop with the condition do until (status = 'advance'). So for kids who have a switch, it works great. For those that don't, I don't have the date.
I rather work this out using the retain to be honest, however any help is appreciated <3
If anyone can give a hint or tip that might make this easier, please do.
Thanks in advance
I'm working with long format data from an educational psychology study.
I have the following setup:
Multiple observations per ID, each with a 'status' variable and a 'date' variable.
For example:
Code:
ID Status Date
1 Advanced 2011Jun2
1 Remedial 2011jun12
1 Advanced 2011jul18
1 Remedial 2011july29
2 Advanced 2011may05
2 Advanced 2011may07
2 Advanced 2011may08
3 Remedial 2011apr04
3 Remedial 2011apr09What I'm interested in is extracting the first time a student was able to switch from a remedial (assumed to be default) to an advance program. So in essence, I need to extract the first occurrence of status = 'advance' for each student. For those who never switch into advance (that remain remedial) I'd like to just extract the date of their last assessment.
I've tried using the retain statement to no luck. I've been able to transpose the data using proc transpose + arrays to search for the first occurrence of the 'Advance', but I'm not sure how to code the part for students who never get to advance (i.e, pure remedial) because remember I do need their last date of assessment for these kids. For this approach I was using a "do until" loop with the condition do until (status = 'advance'). So for kids who have a switch, it works great. For those that don't, I don't have the date.
I rather work this out using the retain to be honest, however any help is appreciated <3
If anyone can give a hint or tip that might make this easier, please do.
Thanks in advance