ex0333: Brain Size and Litter Size

In Sleuth2: Data Sets from Ramsey and Schafer's "Statistical Sleuth (2nd Ed)"

Description

Relative brain weights for 51 species of mammal whose average litter size is less than 2 and for 45 species of mammal whose average litter size is greater than or equal to 2.

Usage

ex0333

Format

A data frame with 96 observations on the following 2 variables.

Brainsize

relative brain sizes (1000 * Brain weight/Body weight) for 96 species of mammals

Littersize

factor variable with levels "Small" and "Large"

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

References

Sacher, G.A. and Staffeldt, E.F. (1974). Relation of Gestation Time to Brain Weight for Placental Mammals: Implications for the Theory of Vertebrate Growth, American Naturalist 108: 593–613.

See Also

case0902

Examples

str(ex0333)

Example output

'data.frame':	96 obs. of  2 variables:
 $ Brainsize : num  0.42 0.86 0.88 1.11 1.34 ...
 $ Littersize: Factor w/ 2 levels "Small","Large": 1 1 1 1 1 1 1 1 1 1 ...

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