Data compare the heights of crossed plants with self-fertilized plants of the wild mignonette reseda lutea. Plants were paired within the pots in which they were grown, with one on one side and one on the other.
This data frame contains the following columns:
heights of the crossed plants
heights of the self-fertilized plants
Darwin, Charles. 1877. The Effects of Cross and Self Fertilisation in the Vegetable Kingdom. Appleton and Company, New York, page 118.
print("Is Pairing Helpful? - Example 4.3.1") attach(mignonette) plot(cross ~ self, pch=rep(c(4,1), c(3,12))); abline(0,1) abline(mean(cross-self), 1, lty=2) detach(mignonette)