英语应用语言学论文写作定量数据分析.ppt

Ifyouwanttoknowtherelativestandingofanyparticularscoreinagroupofscores youcanshowitbyaPercentilescore 陈雪茹武静2012 11 23 Definition Itcanbedefinedasanumberwhichrepresentsthepercentofscoresthataparticularrawscoreexceeds 如果将一组数据从大到小排序 并计算相应的累计百分位 则某一百分位所对应数据的值就称为这一百分位的百分位数 Formula Cumulativefrequency 累计频数 isthesumofallthefrequenciesuptoandincludingthatvalue Nrepresentsthetotalnumberofscores CumulativeFPercentile 100 N ExampleofPercentile Forexample onestudentreceivedascoreinthe67thpercentileonTOEFL itmeansthat67 ofstudentswhotookthetestscoredlowerthanthatlevel Orwesaythathisscoreishigherthan67 oftheotherpeopletakingthetestbutlowerthan33 ofthepeople ExampleofPercentile Selectingappropriatestatistics Therearevariousstatisticsforyoutochoosefrom youhavetochoosethemostappropriateonetoansweryourresearchquestions TherearefourfrequentlyusedproceduresintheStatisticsmenuofSPSS Summarize Comparemeans CorrelateandRegression 在SPSS中的Statistics菜单项中最常见的四种统计程序 Summarize 概括 Comparemeans 比较均值 CorrelateandRegression 回归 除了Summarize外 所有统计程序的运行都必须以正态分布的假设为前提 Summarize 概括 WhenyouopentheStatisticsmenu SummarizeappearsonthetopofthelistWhichincludesavarietyofoptions Onlytwooptionsareexplainedhere Frequencies 频数统计 andDescriptives 描述性统计 Forexample ifyouwanttoknowhowmanystudentsarefemalesandhowmanyAremalesinastudy youcanoperateFrequencies Wecanseethatthereare18malesoccupying23 4 and59females 76 6 Frequencies 频数统计 Descriptives 描述性统计 Bydescriptives wecanknowwhatistheaveragescoreandwhatisthestandarddeviationofeachcategory 描述性统计告诉我们平均分和每个范畴的标准差 Table Desc