The interrater reliability of the Psychotic Inpatient Profile.

The interrater reliabilities of the 12 scales of the Psychotic Inpatient Profile (PIP) were assessed in three independent samples. These reliabilities were found to be consistently low for the three samples. Several possible sources of low reliability were investigated, and evidence to support the hypothesis that consistent rater biases might have contributed to this low reliability was found. The authors make several suggestions of ways to improve PIP's reliability.