Dispositional decisions in ten psychiatric emergency rooms in New York State were examined using logistic regression. Variables influencing recommendations for inpatient or outpatient psychiatric treatment were fairly consistent across the hospitals. All terms used in the regression model were interactions formed from five variables: dangerous behavior as a reason for referral, severity of the mental disorder, the hospital where the patient presented, current signs of psychosis, and a diagnosis of major mental illness. A sixth variable, assaultive behavior in the emergency room, also influenced disposition decisions but could not be considered in the model because all patients with that characteristic were referred for inpatient treatment. A model of disposition decisions based on interactions of variables may be especially powerful because it captures the dynamic combination of factors clinicians encounter.