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医学软件及其应用优质文档.ppt

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医学软件及其应用主要内容：定量资料的假设检验样本均数与总体均数比较的t检验例1(Ex_1)例２操作One-samplettest--------------------------------------------------------------------------------|ObsMeanStd.Err.Std.Dev.[95%Conf.Interval]---------+---------------------------------------------------------------------x|1012.59.51627951.63261911.4220913.75791--------------------------------------------------------------------------------Degreesoffreedom:9Ho:mean(x)=14.02Ha:mean<14.02Ha:mean~=14.02Ha:mean>14.02t=-2.7698t=-2.7698t=-2.7698P<t=0.0109P>|t|=0.0218P>t=0.9891配对设计ｔ检验例3(配对设计)(Ex_3)ttestx2=x1独立性正态性方差齐性方差齐：t检验方差不齐:t’检验两组资料间的方差齐性检验成组设计ｔ检验例５（成组设计）(Ex_5)Varianceratiotest---------------------------------------------------------------------------------Group|ObsMeanStd.Err.Std.Dev.[95%Conf.Interval]---------+-----------------------------------------------------------------------1|12271.89172.99558910.37702265.2984278.48492|15235.20673.71566214.3907227.2374243.176---------+----------------------------------------------------------------------combined|27251.51114.31252922.40856242.6466260.3756--------------------------------------------------------------------------------Ho:sd(1)=sd(2)F(11,14)observed=F_obs=0.520F(11,14)lowertail=F_L=F_obs=0.520F(11,14)uppertail=F_U=1/F_obs=1.923Ha:sd(1)<sd(2)Ha:sd(1)~=sd(2)Ha:sd(1)>sd(2)P<F_obs=0.1404P<F_L+P>F_U=0.2649P>F_obs=0.8596ttestx,by(group)Two-samplettestwithequalvariances------------------------------------------------------------------------------------Group|ObsMeanStd.Err.Std.Dev.[95%Conf.Interval]---------+-------------------------------------------------------------------------1|12271.89172.99558910.37702265.2984278.48492|15235.20673.71566214.3907227.2374243.176---------+-------------------------------------------------------------------------combined|27251.51114.31252922.40856242.6466260.3756---------+-------------------------------------------------------------------------diff|36.6854.9500326.4902246.87978---------------------------------------------------------------------