ex0221: Bumpus's Data on Natural Selection

In Sleuth3: Data Sets from Ramsey and Schafer's "Statistical Sleuth (3rd Ed)"

Description

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.

Usage

ex0221

Format

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

Humerus

humerus length of adult male sparrows (inches)

Status

factor variable indicating whether the sparrow perished or survived in a winter storm, with levels Perished and Survived

Source

Ramsey, F.L. and Schafer, D.W. (2013). The Statistical Sleuth: A Course in Methods of Data Analysis (3rd ed), Cengage Learning.

See Also

ex2016

Examples

str(ex0221)

Example output

'data.frame':	59 obs. of  2 variables:
 $ Humerus: num  0.687 0.703 0.709 0.715 0.728 0.721 0.729 0.723 0.728 0.723 ...
 $ Status : Factor w/ 2 levels "Perished","Survived": 2 2 2 2 2 2 2 2 2 2 ...

Sleuth3 documentation built on May 2, 2019, 6:41 a.m.