10-10-2012 09:56 PM
I am delighted to engage with the SAS support communities. I found the supports, thus far, are very helpful to me with respect to my data manipulations that I am working at this moment.
For this project, I am going to finish my exercises soon, although I would like to post two challenges that I cannot answer myself. These challenges are:
1) Identifying continuity in longitudinal data.
This issue I am looking for a syntax that allows me to calculate changes over time in viral load tests that can be ranged form 1 to over 300 tests in 10 years.
2) When I calculate changes in the first year of VL, I have observed that my data was no longer in longitudinal. I observe that I have one record for each subject study.
My question here how can I keep my data to be longitudinal format.
I look forward to hearing everyone's assistance.
10-12-2012 01:18 PM
Do you need a running cumulative change for each patient?
How do you calculate change in viral load, change in a count or a percent or some other rate?
10-12-2012 03:32 PM
I will use log10 as well as actual values. I do not use percentage.
Re. cumulative changes, I will look for each subject as well as for the cohort.