On Thu, Jan 31, 2013 at 10:29 AM, Weijia Wang wwang@gmail.com wrote:
Hi,
I have a new question about subsetting in R.
Say we have this data frame:
PT_ID Blood_Pressure OBS_TYPE
92 1900 90.0 DBP
94 1900 90.0 DBP
174 2900 140.0 SBP
176
Well, since no one has responded
Please use ?dput to provide data in your posts.
There are likely zillions of way to go about this. Following is one
way based on ?duplicated that I think works, but I make no claims for
either elegance or efficiency. Others may do lots better. But maybe it
To: Weijia Wang
Cc: r-help@r-project.org
Subject: Re: [R] Locate Patients who have multiple high blood pressure
readings
Well, since no one has responded
Please use ?dput to provide data in your posts.
There are likely zillions of way to go about this. Following is one
way
On Thu, Jan 31, 2013 at 10:51 AM, Weijia Wang wwang@gmail.com wrote:
On Thu, Jan 31, 2013 at 10:29 AM, Weijia Wang wwang@gmail.com wrote:
Hi,
I have a new question about subsetting in R.
Say we have this data frame:
PT_ID Blood_Pressure OBS_TYPE
92 1900 90.0
.
- Original Message -
From: Weijia Wang wwang@gmail.com
To: r-help@r-project.org
Cc:
Sent: Thursday, January 31, 2013 10:51 AM
Subject: [R] Locate Patients who have multiple high blood pressure readings
On Thu, Jan 31, 2013 at 10:29 AM, Weijia Wang wwang@gmail.com wrote:
Hi,
I have a new
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