mplot {Rlab}

Plots factor means

Description

Graphs means for two-way factor combinations (interaction plots). Any number of factors may be included and all possible two factor combinations will be plotted.

Usage

mplot(y, ..., both = FALSE)

Arguments

y

Vector of responses whose means are graphed.

...

Vectors of independent variables on which the responses' means are broken down.

both

If TRUE, creates additional plots with the opposite factor on the x-axis.

See Also

interaction.plot, means, mean

Examples

# Create a data set with three factors (age, gender and number of water breaks)
race<-data.frame(c(1.02,.99,1.11,1.30,1.09,1.26,1.21,1.19,1.30,1.45,1.34,1.49),
                 c('M','M','M','M','M','M','F','F','F','F','F','F'),
                 c('under 50','under 50','under 50','over 50','over 50','over 50',
                   'under 50','under 50','under 50','over 50','over 50','over 50'),
                 c(1,0,2,2,0,1,2,1,0,2,1,0))
names(race)<-c("time","gender","age","water")


# Show mean times broken by age, gender and age & gender
mplot(race$time, race$age, race$gender)

# Show 2 plots, with age and then gender along the x-axis
mplot(race$time, race$age, race$gender, both=TRUE)

# Now also consider water breaks
mplot(race$time, race$age, race$gender, race$water, both=TRUE)

# Print the means for the above plots
means(race$time, race$age, race$gender, race$water)