NormalAndTPower
Construct a power graph based on the NTplot.
Construct a power graph based on the NTplot
. The exported function
powerplot
calls NormalAndTPower
to construct a power curve or beta curve (operating
characteristic curve) (or both) from its argument and catenates it to the original
graph. The unexported function NormalAndTPower
does the
construction.
- Keywords
- hplot
Usage
powerplot(nt, ...)# S3 method for NormalAndTplot
powerplot(nt, power=TRUE, beta=FALSE, ...,
hh=if (power && beta) c(6,2,2) else c(6,2))
NormalAndTPower(nt,
which=c("power","beta"),
digits=4,
digits.top.axis=digits, digits.left=digits,
col.power=attr(nt, "color")["col.power"],
col.beta=attr(nt, "color")["col.beta"],
cex.pb.axis=1, cex.left.axis=1, cex.xbar=1,
lwd.reference=4, lwd.line=2,
main=which, ...)
Arguments
- nt
For the generic
powerplot
, an object. For theNormalAndTplot
method, a"NormalAndTplot"
object fromNTplot
.- power, beta
Logical. If
TRUE
, then display that graph, else don't display it. Used bypowerplot
.- which
Which graph is to be displayed?
"power"
for the power curve, or"beta"
for the operating characteristic curve. Used byNormalAndTPower
.- …
Additional arguments passed on to methods.
- hh
The
h
argument forresizePanels
.- digits.top.axis, digits.left, digits, cex.pb.axis, cex.left.axis, cex.xbar
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 set bothdigits.axis
anddigits.left
at the same time. These number is passed to theformat
function.cex.top.axis
is thecex
value for the top axis values.cex.left.axis
is thecex
value for the observed power or beta on the left axis.cex.xbar
is thecex
value for the horizontal axis.- col.power, col.beta
Colors used for the crosshairs on the power and beta panels. The default values are the colors used for the power and beta regions of the
NTplot
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.- main
Main title for graph.
Value
"trellis"
object.
Examples
# NOT RUN {
nt <- NTplot(mean0=2, mean1=4, sd=3, n=20, xlim=c(-.1, 6.1), xbar=3.5)
powerplot(nt)
# }
# NOT RUN {
tt <- NTplot(mean0=2, mean1=4, sd=3, n=20, xlim=c(-.1, 6.1), xbar=3.5, df=4, distribution.name="t")
powerplot(tt)
ntc <- NTplot(xbar=2, sd=3, n=20, xlim=c(-.1, 4.1), type="confidence",
alpha.left=.025, alpha.right=.025)
ntc
try(powerplot(ntc))
# }