darwin data frame has 15 rows and 3 columns.
Charles Darwin conducted an experiment to examine the superiority of cross-fertilized plants over self-fertilized plants. 15 pairs of plants were used. Each pair consisted of one cross-fertilized plant and one self-fertilized plant which germinated at the same time and grew in the same pot. The heights of the plants were measured at a fixed time after planting. Four different pots were used.
This data frame contains the following columns:
the heights of the cross-fertilized plants (in inches);
the heights of the self-fertilized plants (in inches);
a factor variable for the pot number.
The data were obtained from
Andrews, D. F. and Herzberg, A. M. (1985) Data: A Collection of Problems From Many Fields for the Student and Research Worker (Chapter 2). New York: Springer-Verlag.
Darwin, C. (1878) The Effects of Cross and Self Fertilisation in the Vegetable Kingdom (2nd ed.). London: John Murray.
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