Bumpus's Data on Natural Selection (Humerus)
As evidence in support of natural selection, Bumpus presented measurements on house sparrows brought to the Anatomical Laboratory of Brown University after an uncommonly severe winter storm. Some of these birds had survived and some had perished. Bumpus asked whether those that perished did so because they lacked physical characteristics enabling them to withstand the intensity of that particular instance of selective elimination. The data are on the humerus (arm bone) lengths for the 24 adult male sparrows that perished and for the 35 adult males that survived.
case0201
A data frame with 59 observations on the following 2 variables.
HumerusHumerus length of adult male sparrows (in inches)
Statusfactor variable indicating whether the sparrow perished or survived in a winter storm
Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.
str(case0201) with(subset(case0201, Status=="Perished"), stem(Humerus, scale=10)) with(subset(case0201, Status=="Survived"), stem(Humerus))
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