plotAncova {asbio}

Creates plots for one way ANCOVAs

Description

ANCOVA plots are created, potentially with distinct line types and/or symbols and colors for treatments. A legend relating ciphers to treatments is also included.

Usage

plotAncova(model, pch = NULL, lty = NULL, col = NULL, leg.loc = "topright", 
leg.cex = 1, leg.bty = "o", leg.bg = par("bg"), legend.title = NULL,...)

Arguments

model

Result from lm. An additive model results in a common slope plot. An interaction model results in distinct slopes for treatments

pch

A scalar, or a vector of length n defining symbols for treatments.

lty

A scalar, or a vector of length n defining line types for treatments.

col

A scalar, or a vector of length n defining color for symbols and lines.

leg.loc

Location of the legend. "n" suppresses the legend.

leg.cex

Character expansion from legend.

leg.bty

Box type from legend.

leg.bg

Background color from legend.

legend.title

Legend title from legend.

...

Additional arguments from plot

Value

Returns an ANCOVA plot and model coefficients.

Author(s)

Ken Aho

See Also

lm

Examples

x <- rnorm(20)
y <- 3 * x + rnorm(20)
cat <- c(rep("A",5),rep("B",5),rep("C",5),rep("D",5))
l <- lm(y ~ x * cat)
plotAncova(l, leg.loc = "bottomright")