gcvplot {locfit} | R Documentation |
The gcvplot
function loops through calls to the gcv
function (and hence to link{locfit}
), using a different
smoothing parameter for each call.
The returned structure contains the GCV statistic for each fit, and can
be used to produce an GCV plot.
gcvplot(..., alpha, df=2)
... |
arguments to the gcv , locfit
functions. |
alpha |
Matrix of smoothing parameters. The gcvplot function
loops through calls to gcv , using each row of
alpha as the smoothing parameter in turn. If alpha
is provided as a vector, it will be converted to a one-column
matrix, thus interpreting each component as a nearest neighbor
smoothing parameter. |
df |
Degrees of freedom to use as the x-axis. 2=trace(L), 3=trace(L'L). |
An object with class "gcvplot"
, containing the smoothing
parameters and GCV scores. The actual plot is produced using
plot.gcvplot
.
locfit
,
locfit.raw
,
gcv
,
plot.gcvplot
,
summary.gcvplot
data(ethanol, package="locfit") plot(gcvplot(NOx~E, data=ethanol, alpha=seq(0.2, 1.0, by=0.05)))