Actually they say they used SAS, and Googling for "SAS local linear
logistic" suggests they used PROC GAM with the LOESS() smoother.
Probably quite similar to gam::gam().
-thomas
On Sun, Jun 5, 2011 at 9:12 AM, Thomas Lumley wrote:
> The Stanform gam() [gam package] has choices of spline or
The Stanform gam() [gam package] has choices of spline or
local-polynomial (defaulting to local-linear) smoothers. That's
probably the best match for the description. It shouldn't be
necessary to guess -- the paper should have cited the package -- but
we know that is often missed.
-thomas
Take a look at packages mgcv or gam (and probably others). Different
smoothers are used, but it's nonlinear, nonparametric logistic
regression. which is usually the important part. It also penalizes,
which can be even more important than which smoother is used.
-- Bert
On Sat, Jun 4, 2011 at 9:02
On Jun 4, 2011, at 11:41 AM, zhu yao wrote:
Dear UseRs:
Recently, I have read an article regarding the association between
age and
lymph node metastases.
http://jco.ascopubs.org/content/27/18/2931.long
In statistical analysis, the authors stated "Because a nonlinear
relationship between age
Dear UseRs:
Recently, I have read an article regarding the association between age and
lymph node metastases.
http://jco.ascopubs.org/content/27/18/2931.long
In statistical analysis, the authors stated "Because a nonlinear
relationship between age and lymph node involvement was expected based on
e
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