View source: R/lines.segmented.R
lines.segmented | R Documentation |
Draws bars relevant to breakpoint estimates (point estimate and confidence limits) on the current device
## S3 method for class 'segmented'
lines(x, term, bottom = TRUE, shift=FALSE, conf.level = 0.95, k = 50,
pch = 18, rev.sgn = FALSE, .vcov=NULL, .coef=NULL, ...)
x |
an object of class |
term |
the segmented variable of the breakpoints being drawn. It may be unspecified when there is a single segmented variable. |
bottom |
logical, indicating if the bars should be plotted at the bottom ( |
shift |
logical, indicating if the bars should be ‘shifted’ on the y-axis before plotting. Useful for multiple breakpoints with overlapped confidence intervals. |
conf.level |
the confidence level of the confidence intervals for the breakpoints. |
k |
a positive integer regulating the vertical position of the drawn bars. See Details. |
pch |
either an integer specifying a symbol or a single character to be used
in plotting the point estimates of the breakpoints. See |
rev.sgn |
should the signs of the breakpoint estimates be changed before plotting? see Details. |
.vcov |
The full covariance matrix of estimates. If unspecified (i.e. |
.coef |
The regression parameter estimates. If unspecified (i.e. |
... |
further arguments passed to |
lines.segmented
simply draws on the current device the point estimates and relevant
confidence limits of the estimated breakpoints from a "segmented" object. The y coordinate
where the bars are drawn is computed as usr[3]+h
if bottom=TRUE
or
usr[4]-h
when bottom=FALSE
, where h=(usr[4]-usr[3])/abs(k)
and
usr
are the extremes of the user coordinates of the plotting region.
Therefore for larger values of k
the bars are plotted on the edges.
The argument rev.sgn
allows to change the sign of the breakpoints before plotting. This may
be useful when a null-right-slope constraint is set.
plot.segmented
to plot the fitted segmented lines, and
points.segmented
to add the fitted joinpoints.
## See ?plot.segmented
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