Figure 3.

Biplot of Factor 1 cat's positive interactions and Factor 3 cat's playfulness and child's positive reaction (Factor 1 increases going to the right; Factor 3 increases going up). Upper right quadrant is optimal; e.g., an intact or female intact, a cat from a breeder, or a cat in Europe on average scored better than average for positive interactions; a cat from a newspaper ad scored worse. Adopting a young cat was associated with better scores on both factors than one adopted when older Points plotted in blue represent the variables that were used in the PCA. Points plotted in green, purple or black place subgroups of responses on the graph, corresponding to neuter/gender status, cat source, and miscellaneous categorical predictors, respectively. Points that plot in the same general direction relative to the origin are positively associated, while ones that plot on opposite directions are negatively associated. The strength of an association is related to the distance from the origin, so the points closest to the origin exhibit negligible associations.