Rorschach Inkblot Test, Personality tests
Frequent and Infrequent concepts were identified in psychological reports. These concepts were presented with established Barnum statements to 70 college students for estimation of the percentages of persons described by each concept. Significant differences between the three concept categories were obtained although rates of endorsement for all concepts were high.
Dana, Richard H. and Thomas, Patricia A., "Extended Report of Rorschach Personality and Barnum Statements" (1982). Regional Research Institute. 16.