ex0221: Bumpus's Data on Natural Selection (Weight)

Description Usage Format Source See Also Examples


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 the weights, in grams, for the 24 adult male sparrows that perished and for the 35 adult males that survived.




A data frame with 59 observations on the following 2 variables.


weight of adult male sparrows (in grams)


factor 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.

See Also

case0201, ex2016



Example output

'data.frame':	59 obs. of  2 variables:
 $ Weight: num  24.5 26.9 26.9 24.3 24.1 ...
 $ Status: Factor w/ 2 levels "perished","survived": 2 2 2 2 2 2 2 2 2 2 ...

Sleuth2 documentation built on May 2, 2019, 7:01 a.m.