HH (version 3.1-8)

NormalAndT.power: Construct a power graph based on the NormalAndT plot.

Description

Construct a power graph based on the NormalAndT plot.

Usage

NormalAndT.power(nt,
                   which=c("power","beta"),
                   digits=4,
                   digits.top.axis=digits, digits.left=digits,
                   col.power=attr(nt, "color")["col.power"],
                   cex.top.axis=1, cex.left.axis=1,
                   lwd.reference=4, lwd.line=2,
                   main=which)
NormalAndT.and.power(nt, which="power",
                       pnt=NormalAndT.power(
                         nt,
                         digits.top.axis=digits.top.axis,
                         digits.left=digits.left,
                         which=which,
                         cex.top.axis=cex.top.axis, cex.left.axis=cex.left.axis,
                         lwd.reference=4, lwd.line=2),
                       digits=4, digits.top.axis=digits, digits.left=digits,
                       cex.top.axis=1, cex.left.axis=1,
                       display.ylab=TRUE)

Arguments

nt

A "NormalAndT" object from NormalAndTplot.

which

Which graph is to be displayed? "power" for the power curve, or "beta" for the operating characteristic curve.

digits.top.axis, digits.left, digits, cex.top.axis, cex.left.axis

digits.top.axis is the number of significant digits for the top axis. digits.left is the number of significant digits for the observed power or beta on the left axis. digits is a convenience argument to

col.power

Color used for the crosshairs on the power or beta panel. The default value is the color used for the power region of the NormalAndT panel.

lwd.reference, lwd.line

lwd values for the power or beta panel. lwd.line is used for the power curve or beta curve. lwd.reference is used for the crosshairs.

pnt

A "trellis" object produced by NormalAndT.power.

display.ylab

logical. Should the ylab for the panels be displayed?

main

Main title for graph.

Value

• "trellis" object.

Details

NormalAndT.power constructs a power graph from the "NormalAndT" object. NormalAndT.and.power calls NormalAndT.power to construct a power graph from the "NormalAndT" object, and then catenates it with the c.trellis function to the original "NormalAndT" object.

Examples

nt <- NormalAndTplot(mean0=2, mean1=4, sd=3, n=20, xlim=c(-.1, 6.1))
NormalAndT.and.power(nt)

tt <- NormalAndTplot(mean0=2, mean1=4, sd=3, n=20, xlim=c(-.1, 6.1), df=4, distribution.name="t")
NormalAndT.and.power(tt)

ntc <- NormalAndTplot(xbar=2, sd=3, n=20, xlim=c(-.1, 4.1), type="confidence",
                    alpha.left=.025, alpha.right=.025)
ntc
try(NormalAndT.and.power(ntc))