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:2003-11-12:(1949-),,;E2mail:zhanggq@scau.edu.cn:([2004]130)1,1,2,1(1,510642;2,518040):,,,,.:;;;:O212.4:A:1001-411X(2005)02-0108-04ResearchonurbanvegetablesecuritymonitoringsystemanditsapplicationZHANGGuo2quan1,XIAOLi1,ZHANGBing2,CENGuan2jun1(1CollegeofSciences,SouthChinaAgric.Univ.,Guangzhou510642,China;2SafetyfoodQualitySuperviseInspectionStation,Shenzhen518040,China)Abstract:Bymeansofmultivariatestatisticalmethods,thesamplingdatafromfarmproducewholesalemarketinShenzhenCitywereusedtoanalyzeinthispaper.Basedontheconstructionofvegetablevarietypollutiondynamicresponsecoefficientandcumulativeinfluencecoefficient,theconceptofvegetablevarietysecurityin2dexispresented,whichwasusedtoestablishthevegetablevarietysecuritycontrolsystem.Keywords:vegetable;securityindex;multivariatestatistic;monitoringandpre2warningchart,,,,,,.,,,,,.,,,.11.1(varietyindex,IV),,.1.2.26220054JournalofSouthChinaAgriculturalUniversityVol.26,No.2Apr.2005©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.[1,2].1:x1=100%,x2=100%,(1),x1,x2.X(t)=x1(t)x2(t),,t=1,2,,n.22.1X(t)2x1(t)x2(t),x1(t),x2(t),,x1(t)x2(t),,x1(t)x2(t),x1(t)x2(t),2x1(t)x2(t).X(t)=x1(t)x2(t),X(t),n,t=1,2,,n.f[X(t)],,.x1(t)x2(t),()[3].()(),,.ei(t)Xn2,X(t)i.Y1(t)X(t)1,Y2(t)X(t)2.2:Y1(t)=e1X(t)=e11x1(t)+e21x2(t),Y2(t)=e2X(t)=e12x1(t)+e22x2(t),(2)(2),Y1(t)Y2(t)12,t=1,2,,n.2.2T2jhyh(h=1,2):Var(yn)=1nnj=1y2hj=h.3:T2j=y21j1+y22j2,(3),y1jy2j12,12,T2j().T2j.1:X1,X2,,Xni.i.dNp(u,),^Yi=^ei(X-X),T2j=2i=1Y2iiT2(2,n-1),(4)ei,i.2.3T2j4:(01),jT2j2(n-1)n-2F2,n-2(),j();jT2j2(n-1)n-2F2,n-2(),j().y1j21+y2j222(n-1)n-2F2,n-2(a)¦Cy1j21+y2j22¦C(5),y1y2.C,CWA,CT2(2,n-1)100.j,y1j21+y2j22C,;j9012:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,y1j21+y2j22C,,1.1Fig.1Ellipticchart1,.[3]:=0115,W0.15=LS;=0105,A0105=LW.jT2j2(n-1)(n-2)F2,n-2(0105),().2.4IV:IV=100-10T2(t),T2(t)10IV=0,T2(t)10(6),T2(t)=Y21^1+Y22^2,Y11;Y22,t=1,2,,n.2.5,[4](2).2Fig.2Thesupervisingandpre2warningchartofvegetablesecurityindex2,LSLW2,,23:(S)(W+)(A+),(U)[5].,A+,,,;W+,,,,W+,,,;S,;LSU,;U10010,.LSLWU:LS=100-10T2p,n-1()=100-10p(n-1)n-pFp,n-p(),(=0125)(7)LW=100-10T2p,n-1()=100-10p(n-1)n-pFp,n-p(),(=0105)(8)U=100-10p(n-1)n-p-2,(9),p=2.2,,LS5016,LW1311,U7313,3.3Fig.3Vegetablevarietysecurityindexandthegradestandardofsecuritylevel2.6,,(),,,,,01126©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,(),,,,[6].3200312,[7],,:,(x-u)-1(x-u)2p(015)[6],200312IV[8],14.1200312Tab.1BrassicaparachinensisvarietysecurityindexfromJan2uarytoFebruary,2003number(1)date(January)securityindexnumber(2)date(February)securityindex1010295.5914030499.082030579.6915050685.813060785.8116070998.234080954.3817101185.815101291.5718121359.456131485.8119141693.767151691.2520171894.118171930.7521192076.639202185.8122212370.2410222392.7323242576.3811242688.9624262746.5112272885.8113293085.814200312Fig.4Thesupervisingandpre2warningchartofBrassicaparachinensissecurityindexfromJanuarytoFebruary,20031412:117192262723017546151,W+,,2,,,,;2,S,,12U10010,2,.:[1]DB440300/T20-2001,[S].[2]DB440300/T20-2001,[S].[3],.[M].:,1982.79-289.[4],.[J].,2002,21(2):48-52.[5]JACKSONJE.PrincipalComponentsandFactorAnalysis:PartIPrincipalComponents[J].JournalofQualityTech2nology,1980,12:201-213.[6]JOHNSONRA,WICHERNDW.Appliedmultivariatestatis2ticalanalysis[M].[s.l.]:InternationalEdition,1998.490-497.[7]BOXGEP,COXDR.Ananalysisoftransformation(withdiscussion)[J].JournaloftheRoyalStatisticalSociety(B),1964,26(2):211-252.[8],,,.SASSAS/STAT[M].:,1997.115-400.1112:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.