Abstract
The shapes of distributions of personal incomes in USA have been investigated based on the data for 1993to 2008. Comparisons between four models utilizing various number of parameters have been performed. Thestudiesshowedthattheempiricaldataisdescribedthebestbythethree-parameterDagummodel. Valuesofthemodelsparametersindicatethatthedistributionofpersonalincomescanberegardedaszero-modalone. However,one-parameterexponentialmodelshowsagoodagreementwithdataandcanbetreatedasagoodapproximationof empirical distribution with the exception of the region with very high incomes. The high-income region ischaracterizedbytherelativelygreatnumberofeventsandisdescribedmuchbetterbytheDagumdistribution.PACS:89.65.-s,89.65.Cd
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