unimodalunimodal regressionunimodalityuninformativeness of a likelihood functionunionunion intersection principleunion of setsunique factorizationuniqueness conditionuniqueness principleuniqueness theoremunitunit matrixunit root testunitary matrixunivariateunivariate distributionuniversal dominationuniversal probability generating functionunlikelihoodunobservable random variableunreliability functionunrestricted random sampleunstable stateunsupervised classificationuntiltingupper boundupper bounds varianceupper classupper easing inequalityupper integralupper limitupper semilatticeupper triangular matrixupper variationuptimeupward biasurnurn modelusual provider continuity indexuthoff type tests for heavy tailsutilityutility functionutility theoryutilizationutilization analysis
