WalkingStickHeads {abd}

Walking Stick Head Width

Description

Two measures of head width (head.width) for each of 25 walking sticks (Timema cristinae).

Format

A data frame with 50 observations on the following 2 variables.

specimen

a factor with levels 1-25

head.width

a numeric vector

Source

Nosil, P. and B.J. Crespi. 2006. Experimental evidence that predation promotes divergence in adaptive radiation. Proceedings of the National Academy of Sciences (USA) 103: 9090-9095.

References

http://www.sfu.ca/biology/faculty/crespi/pdfs/96-Nosil&Crespi2006PNAS.pdf

Examples

aggregate(head.width ~ specimen, data=WalkingStickHeads, mean) -> WS
histogram(~ head.width, WS)