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blood_pressure
2013 Jan 31
3
Locate Patients who have multiple high blood pressure readings
On Thu, Jan 31, 2013 at 10:29 AM, Weijia Wang <wwang.nyu@gmail.com> wrote:
> Hi,
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> I have a new question about subsetting in R.
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> Say we have this data frame:
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> PT_ID Blood_Pressure OBS_TYPE
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> 92 1900 90.0 DBP
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> 94 1900 90.0 DBP
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> 174 2900 140.0 SBP
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> 176 2900 130.0 SBP
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> 180 3900 120.0 SBP
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> 268 3900 150.0 SBP
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> 268 3900 90.0 DBP
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