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The coking data frame has 18 rows and 3 columns. It contains the time to coking in an experiment where the oven width and temperature were varied.
coking
This data frame contains the following columns:
width
a factor with levels 4, 8, and 12, giving the oven width in inches.
4
8
12
temp
a factor with levels 1600 and 1900, giving the temperature in Fahrenheit.
1600
1900
time
a numeric vector, time to coking.
attach(coking) matplot(tapply(time,list(width,temp),mean)) detach(coking)
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