Counts of yellow/white and sweet/starchy kernels on each of 4 maize ears by 15 observers.
A data frame with 59 observations on the following 6 variables.
number of yellow starchy kernels
An ear of white sweet corn was crossed with an ear of yellow starchy corn. The F1 kernels of the cross were grown and a sample of four ears was harvested. The F2 kernels of these ears were classified by each of 15 observers into white/yellow and sweet/starchy.
By Mendelian genetics, the kernels should occur in the ratio 9 yellow starch, 3 white starch, 3 yellow sweet, 1 white sweet.
The observers had the following positions:
|2||Asst plant pathologist|
|4||Asst prof agronomy|
|11||Prof plant physiology|
|12||Instructor plant physiology|
|13||Asst plant physiology|
|14||Asst plant physiology|
Raymond Pearl, 1911. The Personal Equation In Breeding Experiments Involving Certain Characters of Maize, Biol. Bull., 21, 339-366. http://www.biolbull.org/cgi/reprint/21/6/339.pdf
1 2 3 4 5 6 7 8 9 10 11 12 13 14
data(pearl.kernels) dat <- pearl.kernels require(lattice) xyplot(ys+yt+ws+wt~obs|ear, dat, type='l', as.table=TRUE, auto.key=list(columns=4), main="pearl.kernels", xlab="observer",ylab="kernels", layout=c(4,1), scales=list(x=list(rot=90))) # Test hypothesis that distribution is 'Mendelian' 9:3:3:1 dat$pval <- apply(dat[, 3:6], 1, function(x) chisq.test(x, p=c(9,3,3,1)/16)$p.val) dotplot(pval~obs|ear, dat, layout=c(1,4), main="pearl.kernels", ylab="P-value for test of 9:3:3:1 distribution")
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