ex0722: Crab Claw Size and Force

Description Usage Format Source References Examples

Description

As part of a study of the effects of predatory intertidal crab species on snail populations, researchers measured the mean closing forces and the propdus heights of the claws on several crabs of three species.

Usage

1

Format

A data frame with 38 observations on the following 3 variables.

Force

closing strength of claw of the crab

Height

propodus height of claw of the crab

Species

species to which the crab belongs

Source

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

References

Yamada, S.B. and Boulding, E.G. (1992). Claw Morphology, Prey Size Selection and Foraging Efficiency in Generalist and Specialist Shell-Breaking Crabs. Journal of Experimental Marine Biology and Ecolog, 220 191–211.

Examples

1

Example output

'data.frame':	38 obs. of  3 variables:
 $ Force  : num  3.2 6.4 2 2 4.9 3 2.9 9.5 4 3.4 ...
 $ Height : num  5 6 6.4 6.5 6.6 7 7.9 7.9 8 8.2 ...
 $ Species: Factor w/ 3 levels "Cancer productus",..: 2 2 2 2 2 2 2 2 2 2 ...

Sleuth3 documentation built on May 31, 2017, 1:56 a.m.