Regression analysis is applied to civil commitment decisions to evaluate the importance of psychiatric opinion, externally visible “facts,” and judges' attitudes. Indices were constructed of evidence of dangerousness, based on information presented at court hearings, and of judges' attitudes toward psychiatrists, mental hospitals, and the mentally ill, based on their responses to Likert type items. Additional variables include respondent's prior commitment status, diagnosis, court behavior, race, sex, age, and family caring. The analysis suggests that “facts” and psychiatric opinion but not judges' attitudes are significant influences on commitment decisions.