Hi:
Another way to do this is to use one of the summarization packages.
The following uses the plyr package.
The first step is to create a function that takes a data frame as
input and outputs either a data frame or a scalar. In this case, the
function returns a scalar, but if you want to carry a
ean
`·.,, ><(((º> `·.,, ><(((º> `·.,, ><(((º>
Jean V. Adams
Statistician
U.S. Geological Survey
Great Lakes Science Center
223 East Steinfest Road
Antigo, WI 54409 USA
From:
"Michael Karol"
To:
Date:
08/02/2011 09:35 AM
Subject:
[R] Help with aggre
Dear R-experts:
I am using a function called AUC whose arguments are data, time, id, and
dv.
data is the name of the dataframe,
time is the independent variable column name,
id is the subject id and
dv is the dependent variable.
The function computes area under the curve by trapezoidal
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