Hi.
I am working with hierarchical data.
There are several hospital visit by patients. My outcome of interest is
stroke. Patient is diagnosed with stroke in one or other of hospital
visit. I would like to exclude visits prior to diagnosis of first stroke
(index hospitalization) but would keep informations on hospital visit
after index hospitalization. Example of dataset is below:
Pt.ID visit stroke ADMSN_DT
1 1 0 1-Feb-05
1 2 0 1-Apr-05
1 3 0 19-Apr-05
1 4 0 14-Oct-05
1 5 0 30-Oct-05
1 6 1 18-Nov-05
1 7 0 2-Dec-05
2 1 0 10-May-05
2 2 0 30-Nov-05
3 1 0 8-Nov-05
4 1 1 4-Mar-05
4 2 0 9-Jul-05
4 3 0 15-Sep-05
5 1 0 31-Aug-05
6 1 0 20-Jul-05
6 2 0 3-Oct-05
7 1 1 27-Nov-05
8 1 1 29-Jul-05
8 2 1 18-Oct-05
9 1 0 13-Mar-05
9 2 0 11-Jul-05
9 3 0 6-Sep-05
9 4 0 28-Nov-05
9 5 0 19-Dec-05
10 1 0 29-Mar-05
10 2 0 4-Mar-05
10 3 0 25-Jul-05
11 1 1 10-Dec-05
12 1 1 16-Jan-05
12 2 0 19-Jan-05
12 3 0 22-Feb-05
There are close to 800,000 hospitalizations to work with. Please suggest
macro or stata program to drop observation (hospital visits) prior to
index hospitalization but not after. Thanks
Dilip
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