A model is proposed to explain sources of error in perceptions and reports of relative influence. The analysis focuses on the determinants of inferential ability and perceptual bias and their effects on the accuracy of spouses’ self-reports on relative influence. Results have implications for research on groups, indicating that accuracy improves when more specific measures are used. Further, accuracy is improved through the impact of specificity on relative influence, traditionalism, desire to win, empathy, stage in the family lifecycle, education, and sex.
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