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% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/scheffe.R
\name{scheffe}
\alias{scheffe}
\title{Calculate simultaneous confidence limits by Scheffe's method}
\usage{
scheffe(model, newdata = model.frame(model), level = 0.95)
}
\arguments{
\item{model}{Linear model}
\item{newdata}{new data frame}
\item{level}{confidence level (0.95)}
}
\description{
Function to compute the Scheffe corrected confidence
interval for the regression line
}
\examples{
x <- rnorm(100)
d <- data.frame(y=rnorm(length(x),x),x=x)
l <- lm(y~x,d)
plot(y~x,d)
abline(l)
d0 <- data.frame(x=seq(-5,5,length.out=100))
d1 <- cbind(d0,predict(l,newdata=d0,interval="confidence"))
d2 <- cbind(d0,scheffe(l,d0))
lines(lwr~x,d1,lty=2,col="red")
lines(upr~x,d1,lty=2,col="red")
lines(lwr~x,d2,lty=2,col="blue")
lines(upr~x,d2,lty=2,col="blue")
}
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