plotqtplot.lmscreg {VGAM} | R Documentation |
Plots the quantiles associated with a LMS quantile regression.
plotqtplot.lmscreg(fitted.values, object, newdata = NULL, percentiles = object@misc$percentiles, lp = NULL, add.arg = FALSE, y = if (length(newdata)) FALSE else TRUE, spline.fit = FALSE, label = TRUE, size.label = 0.06, xlab = NULL, ylab = "", pch = par()$pch, pcex = par()$cex, pcol.arg = par()$col, xlim = NULL, ylim = NULL, llty.arg = par()$lty, lcol.arg = par()$col, llwd.arg = par()$lwd, tcol.arg = par()$col, tadj = 1, ...)
fitted.values |
Matrix of fitted values. |
object |
A VGAM quantile regression model, i.e.,
an object produced by modelling functions such as vglm
and vgam with a family function beginning with
"lms." , e.g., lms.yjn .
|
newdata |
Data frame at which predictions are made. By default, the original data are used. |
percentiles |
Numerical vector with values between 0 and 100 that specify the percentiles (quantiles). The default is to use the percentiles when fitting the model. For example, the value 50 corresponds to the median. |
lp |
Length of percentiles . |
add.arg |
Logical. Add the quantiles to an existing plot? |
y |
Logical. Add the response as points to the plot? |
spline.fit |
Logical. Add a spline curve to the plot? |
label |
Logical. Add the percentiles (as text) to the plot? |
size.label |
Numeric. How much room to leave at the RHS for the label. It is in percent (of the range of the primary variable). |
xlab |
Caption for the x-axis. See par . |
ylab |
Caption for the x-axis. See par . |
pch |
Plotting character. See par . |
pcex |
Character expansion of the points.
See par . |
pcol.arg |
Color of the points.
See the col argument of par . |
xlim |
Limits of the x-axis. See par . |
ylim |
Limits of the y-axis. See par . |
llty.arg |
Line type. Line type.
See the lty argument of par . |
lcol.arg |
Color of the lines.
See the col argument of par .
|
llwd.arg |
Line width.
See the lwd argument of par .
|
tcol.arg |
Color of the text
(if label is TRUE ).
See the col argument of par .
|
tadj |
Text justification.
See the adj argument of par .
|
... |
Arguments passed into the plot function
when setting up the entire plot. Useful arguments here include
main and las .
|
The above graphical parameters offer some flexibility when plotting the quantiles.
The matrix of fitted values.
While the graphical arguments of this function are useful to the user, this function should not be called directly.
Thomas W. Yee
Yee, T. W. (2004) Quantile regression via vector generalized additive models. Statistics in Medicine, 23, 2295–2315.
Documentation accompanying the VGAM package at http://www.stat.auckland.ac.nz/~yee contains further information and examples.
## Not run: data(bminz) fit = vgam(BMI ~ s(age, df=c(4,2)), fam=lms.bcn(zero=1), data=bminz) qtplot(fit) qtplot(fit, perc=c(25,50,75,95), lcol="blue", tcol="blue", llwd=2) ## End(Not run)