st: Tips for writing code to consolidate observations?

[David <aftrauma@gmail.com>]

I have a large dataset that has multiple observations per individual
and need to convert to single line observations (9,000 lines rows but
really only a few hundred subjects).  The data columns that account
for the multiple observations are unnecessary (see below, e.g.,
ICD-9).  The first occurrence of the data that I need to capture is
the first time the observation occurs.  As there are about 500
subjects, I was hoping there is some code to convert to single
observations/line.  See the example below of what I have and what I
would like it to look like.


(RAW DATA)

ID   ICD-9     GCS  AIS1 AIS2 AIS3 AIS4 AIS5 AIS6

1    823.2     15         0      1       1       1      0      0
1    849.5
1    823.5
2    849.1     12         0      1       3       3      2      1
3    813.4     11         0      0       3       3      7      7
3    775.1


(IDEAL Final Product)

ID   GCS  AIS1 AIS2 AIS3 AIS4 AIS5 AIS6

1      15      0      1       1       1      0      0
2      12      0      1       3       3      2      1
3      11      0      0       3       3      7      7


Much appreciated,

David Zonies, MD MPH
Landstuhl Regional Medical Center
Landstuhl, Germany
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