It would help if you were to tell up which package you are talking about. I
take it this is the survival package and this is the proportioanl hazards
fitting function for case-cohort data.
You would have seen earlier in the code that
method <- match.arg(method)
so at that stage 'method' is a character string. The default is
"Prentice".
so
fitter <- get(method)
will search for an object whose name matches that character string and return
it. Presumably this is a fitting function requested on the call to fit the
model.
So the answer to your question is "The fitter here is whatever method the
user specified on the call. If none were specified it defaults to
Prentice()."
Next you will probably want to know where Prentice() can be found. The answer
is "inside the survival NAMESPACE", and it is not exported. So to see
that function you will need to use
survival:::Prentice
This will most likely become very tedious and ultimately frustrating. You can
always look at code - that's the facility that open source software is
famous for providing - but it really is a last resort. You are much better
reading the documentation very carefully and checking the examples provided.
Trust me, I'm a statistician.
Bill Venables.
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Qian Xiyuan
Sent: Wednesday, 29 September 2010 6:00 AM
To: r-help at r-project.org
Subject: [R] ask for a question with cch function
Dear all,
I am reading the cch function source code. But I can not understand the
following codes. Please help me.
What's the fitter here?
fitter <- get(method)
out <- fitter(tenter = tenter, texit = texit, cc = cc, id = id, X = X, ntot
= nn, robust = robust)
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