医学统计学ppt英文课件CHO2 description of measurement data.ppt

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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