資源描述：
《醫(yī)學(xué)統(tǒng)計學(xué)ppt英文課件CHO2 description of measurement data.ppt》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在教育資源-天天文庫。
1、DescriptionofMeasurementDataChapter2ContentFrequencydistributionDescriptionsofcentraltendencyMeasuresofdispersionNormaldistributionRangeofreferencevalueSection1FrequencyDistribution1、Frequencytable：Example2-1Toacquirethevaluesoftotalcholesterolinserumof101healthyfemaleadultsasb
2、elow,andtoworkoutthefrequencytable.Approach：(1).Range:Thedifferencebetweenthemaximumandtheminimum,R.。(2)．ClassInterval(i):Usuallydividedinto10-15groups(3)．Group：Lowerlimit（L）：thebeginningofeverygroupUpperlimit（U）：theendofeverygroupGroup2.30～2.60～2.90～3.20～…5.60～5.902.30～2.60～(4
3、)．GroupingandCountingFrequencies2.30～2.60～2、Graphoffrequencydistribution3、Useoffrequencytableandgraphoffrequencydistribution1．Describingthetypeoffrequenciesdistribution（1）Symmetricdistribution：（2）Skewedtotherightdistribution/Positivelyskeweddistribution(3)Skewedtotheleftdistrib
4、ution/negativelyskeweddistribution2．Describingthecharacteristicoffrequenciesdistribution3.Findingshadinessvalue4.ConvenientfornextstatisticalanalysisandmanagementSection2DescriptionsofCentralTendencyAverageincommonuse:MeanGeometricmeanMedian1、MeanAdescriptivestatisticusedasamea
5、sureofcentraltendency.Allscoresinasetofscoresareaddedtogetheranddividedbythenumberofsubjects.(1)、CalculateMethodDirectAccount:Formula：Example2-2Tocalculatemeanofthevaluesoftotalcholesterolinserumof100healthyfemaleadultsindirectmethod.WeightingMethod：Formula：Example2-3Calculatet
6、hemeanofvaluesintable2-1byweightingmethod(2)、ApplicationAdapttodescribeSymmetricdistribution，speciallyofnormaldistributiondata.2、GeometricmeanThegeometricmeanissimplytheaverageofsymmetricvaluesafterlogarithmtransition.(1)、CalculateMethodDirectmethodFormula：orExample2-4Toacquire
7、reciprocaltiterofseraasbelow,calculatethegeometricmean.10，20，40，40,160WeightingmethodFormula：(2)、Application：Adapttodataofgeometricprogressiongrowth，especiallyoflogarithmnormaldistribution.3、MedianandPercentile(1)MedianThemedianisthescore/valuethatisexactlyinthemiddleofadistrib
8、ution.Formula:n-oddnumbern-evennumberExample2-5Calcula
