Yield of a chemical reaction
The yield of a chemical reaction was determined in a replicated 2^3 factorial design.
A data frame with 16 observations on the following 4 variables.
temptemperature in degrees C - an ordered factor with levels
120 < 140
catcatalyst - a factor with levels A and B
timetime reaction was run, in minutes - an ordered
factor with levels 10 < 30
yieldyield of the reaction
str(chemreac)
dotplot(temp ~ yield | time, chemreac, groups = cat,
strip = FALSE, strip.left = TRUE, type = c("p", "a"), layout = c(1,2),
auto.key = list(space = "right", title = "Catalyst", lines = TRUE))
summary(fm1 <- lm(yield ~ (time + temp + cat)^3, chemreac))
summary(fm2 <- lm(yield ~ time * temp + cat, chemreac))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.