doBy (version 4.6.21)

crickets: crickets data

Description

name crickets

Usage

crickets

Format

This data frame contains:

species:

Species, see details

temp:

temperature

pps:

pulse per second

Details

Walker (1962) studied the mating songs of male tree crickets. Each wingstroke by a cricket produces a pulse of song, and females may use the number of pulses per second to identify males of the correct species. Walker (1962) wanted to know whether the chirps of the crickets Oecanthus exclamationis and Oecanthus niveus had different pulse rates. See http://www.biostathandbook.com/ancova.html for details. He measured the pulse rate of the crickets (variable pps) at a variety of temperatures (temp):

Examples

	
data(crickets)
coplot(pps ~ temp | species, data=crickets)