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284 11. COUNTING AND CLASSIFICATIONproportion pulled left0.0 0.2 0.4 0.6 0.8 1.0FIGURE 11.3. Model averaged predictions for the chimpanzee data. eblue symbols and lines are the actual data. As in FIGURE 11.2, circles representpulls when the 1/0 option was on the le, triangles represent pulls whenthe 1/1 (prosocial) option was on the le, and filled symbols represent pullswhen another individual was present (social condition). Chimpanzees didappear to prefer the 1/1 (prosocial) option, but were insensitive to whetheranother individual was there to benefit from it.# define link functionp.link

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