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University rankings often include surveys that involve self-assessments, but little is known about the effects of these self-assessments on results. This paper tests for the existence of leniency effects and differential leniency effects, terms borrowed from the performance assessment literature, with a data set of ratings and rankings of Australian university disciplines by Australian academics. It finds support for the leniency effect - these academics rate and rank their own universities higher than others do. It finds less support, however, for the differential leniency effect - academics at the lower-rated universities do not seem to overrate their universities more than do academics from the higher-rated universities. [ABSTRACT FROM AUTHOR]