Fig. 1From: Application of the dyadic data analysis in behavioral medicine research: marital satisfaction and anxiety in infertile couplesThe Actor-Partner Interdependence Model (APIM). Note. X1 and X2 are predictor variables for person 1 and person 2, Y1 and Y2 are their respective outcome variables, and e1 and e2 are the corresponding error terms. The effect of a person’s X on his or her own Y is an actor effect. The effect of a person’s X on the partner’s Y is a partner effect [11]Back to article page