agridat (version 1.16)

stirret.borers: Corn borer control by application of fungal spores.

Description

Corn borer control by application of fungal spores.

Format

A data frame with 60 observations on the following 4 variables.

block

block, 15 levels

trt

treatment, 4 levels

count1

count of borers on August 18

count2

count of borers on October 19

Details

Experiment conducted in 1935, Ottawa. European corn borer infestation was established by application of egg masses to plants. Treatments were applied on July 8 and July 19 at two levels, 0 and 40 grams per acre. The number of borers per plot were counted on Aug 18 and Oct 19.

Examples

# NOT RUN {
data(stirret.borers)
dat <- stirret.borers

require(lattice)
xyplot(count2~count1|trt,dat, main="stirret.borers - by treatment",
       xlab="Early count of borers", ylab="Late count")

# Even though the data are counts, Normal distribution seems okay
# qqmath(~count1|trt, dat, main="stirret.borers")

m1 <- lm(count1 ~ trt + block, dat)
anova(m1)

if(require(effects)){
  e1 <- effect('trt',m1)
  as.data.frame(e1)
  plot(e1, main="stirret.borer")
}

# }