This dataset presents 15 paired data corresponding to the final height of corn data (Zea Mays), one produced by cross-fertilization and the other by self-fertilization. These data were used by Fisher (1936) and were published in Andrews and Herzberg (1985).
A dataframe with 15 rows and 4 columns:
|[,3]||Crossed||numeric||plant height (inches)|
Darwin, C. (1876). The Effect of Cross- and Self-fertilization in the Vegetable Kingdom, 2nd Ed. London: John Murray.
Andrews, D. and Herzberg, A. (1985) Data: a collection of problems from many fields for the student and research worker. New York: Springer.
Fisher, R.A. (1936) The design of Experiments. Oliver & Boyd: London
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data(Corn) # Visualizing two outliers with(Corn,slidingchart(paired(Crossed,Self))) # Very bad matching in these data with(Corn,cor.test(Crossed,Self)) with(Corn,winsor.cor.test(Crossed,Self)) # So the two-sample test is slightly # more interesting than the paired test with(Corn,t.test(Crossed,Self,var.equal=TRUE)) with(Corn,t.test(Crossed,Self,paired=TRUE)) # The Pitman-Morgan test is influenced by the two outliers with(Corn,Var.test(paired(Crossed,Self))) with(Corn,grambsch.Var.test(paired(Crossed,Self))) with(Corn,bonettseier.Var.test(paired(Crossed,Self))) # Lastly, is there a pot effect? with(Corn,plot(paired(Crossed,Self))) with(Corn,plot(paired(Crossed,Self),group=pot))
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