DPQ (version 0.3-3)

pl2curves: Plot 2 Noncentral Distribution Curves for Visual Comparison

Description

Plot two noncentral (chi-squared or \(t\) or ..) distribution curves for visual comparison.

Usage

pl2curves(fun1, fun2, df, ncp, log = FALSE,
          from = 0, to = 2 * ncp, p.log = "", n = 2001,
          leg = TRUE, col2 = 2, lwd2 = 2, lty2 = 3, …)

Arguments

fun1, fun2

function()s, both to be used via curve(), and called with the same 4 arguments, (., df, ncp, log) (the name of the first argument is not specified).

df, ncp, log

parameters to be passed and used in both functions, which hence typically are non-central chi-squared or t density, probability or quantile functions.

from, to

numbers determining the x-range, passed to curve().

p.log

string, passed as curve(...., log = log.p).

n

the number of evaluation points, passed to curve().

leg

logical specifying if a legend() should be drawn.

col2, lwd2, lty2

color, line width and line type for the second curve. (The first curve uses defaults for these graphical properties.)

…

further arguments passed to first curve(..) call.

Value

TODO: inivisible return both curve() results, i.e., (x,y1, y2), possibly as data frame

See Also

curve, ..

Examples

# NOT RUN {
p.dnchiBessel <- function(df, ncp, log=FALSE, from=0, to = 2*ncp, p.log="", ...)
{
    pl2curves(dnchisqBessel, dchisq, df=df, ncp=ncp, log=log,
              from=from, to=to, p.log=p.log, ...)
}

  ## TODO the p.dnchiB()  examples  >>>>>> ../tests/chisq-nonc-ex.R <<<
# }