outcomes of staged encounters with crayfish of known size and strength. Variables are as follows: A) crayfish ID; B & C) mean.size estimated as a score for PC1 and mean.force of the focal crayfish's pair of claws; D) random effect of focal crayfish from model of force predicted by size; E) mean residual force of the pair of claws from a regression of force onto size; F & G) minimal and maximal residual force (i.e., residua strength of weaker and stronger claw, respectively); H) difference in residual strength of stronger and weaker claw; I) ID of opponent crayfish; J) random effect of opponent crayfish from model of force predicted by size; L) opponents size estimate as a score for PC1; M) force of opponent's claws expected from their mean size; N) outcome of encounter, where 0 means focal crayfish fled and 1 means it escalated aggression; O) difference in mean size between focal crayfish and its opponent; P) difference in mean force between focal crayfish and its opponent; Q) difference between mean force of focal crayfish and the expected force of its opponent, given the opponent's mean claw size;