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:2005206227,,,,,,,,50%70%[2]34%,,,,[3][2],,,,,,,,,Leilley,,,,,,,,,5,3,2,,,,,,,1,11,2005,29(2):12212,11JournalofQigiharMedicalCollege,2005,26(4):3921317361,1999,20(1):371:100424337(2006)0220152203:R311:A(261042):,:;;,,,,,,,,,,,,,,,,,,,1,:,,;,,,2Xi(i=1,2,,p),Ci(i=1,2,,251JournalofMathematicalMedicineVol.19NO.22006p),Cii(i=1,2,,p),:C1=C11X1+Ci2X2++CipXpC2=C21X1+C22X2++C2pXpCp=Cp1X1+Cp2X2++CppXp(1)Fi(i=1,2,,m),Aij(i=1,2,,p,j=1,2,,m),:X1=A11F1+Ai2F2++AimFm+e1X2=A21F1+A22F2++A2mFp+e2Xp=Ap1F1+Ap2F2++ApmFm+em(2),,,:K1K2Kp0:C2i1+C2i2++C2ip=1,,:,,ei,3,,,,,,,[(1)],,[(3)]Xi,Ci:X1=C11C1+C21C2++Cp1CpX2=C12C1+C22F2++Cp2CpXp=C1pC1+C2pC2++CppCp(3)m,ei,[(2)],,,Ki,Fi=CiöKi,Aij=KiCji(2):;AijCji,Cij;,,,,,,01,,,,,,,,4,1,,?:80%,85%,70%;pKl,Klm,,Kl=1,1,Bartlettt,,,?,Xi,,:A2i1+A2i2++A2im=h2i(i=1,2,,p)var(Xi)=1=h2i+var(ei),var(ei)=R2i,,h2iR2i,h2i,,,,,,,,;,,,,,3512006192(Thompson)(1939),,(Bartlett)(1948),,,,,,?,,;,,1,,,,?;,,,,,,,:;,,,,(),,1..:,2004,135181.211:,2005,2653181311:,2000,508214RichardA.Johnson,DeanW.Wichern.AppliedMultivariateStatis2ticalAnalysis(5thED)PearsonEducation2003,4265421511:,1995,1932441611:,2001,435458171SAS1:,2003,2532841TheRelationshipofPrincipalComponentAnalysisandFactorAnalysisinMedicalfieldQinHao,etal(DepartmentofHealthStatistic,WeifangMedicalCollege,Weifang261042)AbstractBothprincipalcomponentanalysisandfactoranalysisaretwomultivariatestatisticmethodswhichareusedfrequentlytoexploredatastructure.Thepapercomparestwomethedsfromdifferentperspec2tives:essentialideas,expressivemodel,analyticalprocessandresultantexplanationinordertounderstandthemeasily.Keywordsprincipalcomponentanalysis;factoranalysis;comparison451JournalofMathematicalMedicineVol.19NO.22006