Preliminary Computations to Fit Line to QQ-Plot
USAGE:
prepanel.qqmathline(x, y, distribution)
prepanel.bd.qqmathline(x, y, ...)
ARGUMENTS:
- x
-
sample of data.
- y
-
placeholder.
- distribution
-
a quantile function for the reference distribution, e.g.
qnorm.
This argument is automatically supplied by
qqmath.
VALUE:
A list with components
- dx
-
the change in
x of the fitted line.
This line is used in banking computations
to determine the aspect ratio of the Trellis plot.
- dy
-
the change in
y of the fitted line.
- xlim
-
a vector of length 2 giving the minimum and maximum values for the
x
coordinates on the plot, taking into account the original data
as well as the fitted line.
- ylim
-
similar to
xlim, but dealing with the
y coordinates of the original
data and the fit.