Forehead Patch Size in Collared Flycatachers
Forehead patch size in 30 male Collared Flycatachers measured in two consecutive years.
A data frame with 30 observations on the following 2 variables.
a numeric vector
a numeric vector
Griffith, S.C. and B.C. Sheldon. 2001. Phenotypic plasticity in the expression of a sexually selected trait: neglected components of variation. Animal Behaviour 61: 987-993.
str(FlycatcherPatch) xyplot(patch99 ~ patch98, FlycatcherPatch)
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