A positive integer indicating the order of covariate to be plotted. For example, k=3 requests the standardized score process for the third covariate in the covariate matrix Z.
xlab
a title for the x axis.
ylab
a title for the y axis.
lty
the line type. Default is 1.
frame.plot
a logical variable indicating if a frame should be drawn in the 1D case.
add
a logical variable indicating whether add to current plot?
ylim
a vector indicating the range of y-axis. Default is (-3,3).
xlim
a vector indicating the range of x-axis. Default is NULL.
lwd
the line width, a positive number. Default is 1.
...
further arguments passed to or from other methods
Value
A plot of the standardized score process for object pwreg.score.