particle size statisticspartitionpartition of chi squarepartitioningpascal distributionpassage timespath analysispath diagrampattern recognitionpatterned covariancespatterned meanspaulson approximationpayoff tablepcrpeak of an umbrellapeak testpeakednesspearl reed curvepearson system of distributionspecking orderpedigreepeeling datapenalized likelihoodpenalized maximum likelihood estimationpenaltypenetrancepentagammapentameanpercentagepercentilepercentile pointspercolation theoryperiodperiodic variationperiodicityperiodogram analysispermissible estimatorpermissible valuepermutationpermutation grouppermutation matrixpermutation modelpermutation testpermutational central limit theorempersonalistpersson rootzen estimatorperturbationpesotchinsky designpharmaceuticalphase