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时间:2018-11-28
《第九章配伍区组设计资料的统计分析的stata实现》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、第九章配伍区组设计资料的统计分析的Stata实现配对t检验ttest变量1=变量2配伍区组设计的方差分析anova应变量处理分组变量区组变量方差分析的残差计算在anova命令执行后,执行下列命令predict变量名,residual配伍区组设计的Friedman检验friedman区组1……区组b(见Stata7附加程序)例9-1某研究者用某药物治疗高血压患者10名,治疗前后舒张压的变化情况见表9-1。表9-110名患者用某药物治疗后的舒张压测定值(mmHg)患者编号(1)治疗前(2)治疗后(3)差值(4)=(3)-(2)123456789101151
2、10129109110116116116120104116901088992901101208896-120212218266-4328Stata数据为: x1x211151162110903129108410989511092611690711611081161209120881010496Stata命令为:ttestx1=x2结果为:Pairedttest------------------------------------------------------------------------------Variable
3、ObsMeanStd.
4、Err.Std.Dev.[95%Conf.Interval]---------+--------------------------------------------------------------------x1
5、10114.52.1819976.900081109.564119.436x2
6、1099.93.89429812.3148591.09049108.7095---------+--------------------------------------------------------------------diff
7、1014.63
8、.72737611.7876.16808923.03191------------------------------------------------------------------------------Ho:mean(x1-x2)=mean(diff)=0Ha:mean(diff)<0Ha:mean(diff)!=0Ha:mean(diff)>0t=3.9170t=3.9170t=3.9170P
9、t
10、=0.0035P>t=0.0018P=0.0035,治疗前后舒张压有差别,治疗后下降。例9-2某研究者对8名冻疮患者足部
11、的两个冻疮部位(两个部位冻疮程度非常接近)用两种不同药物治疗,分别观测两个冻疮部位的痊愈时间,结果见表9-2。表9-2两种方法测定患者冻疮痊愈时间时间(天)结果受试者编号(1)药物1(2)药物2(3)差值(4)=(3)-(2)181242109-1369344128576-161010078113810111Stata数据为: x1x2181221093694412576610107811810111.建立检验假设,确定检验水准,两种药物治疗的冻疮痊愈平均时间相同,两种药物治疗的冻疮痊愈平均时间不同Stata命令为:ttestx1=x2结果为:Pair
12、edttest------------------------------------------------------------------------------Variable
13、ObsMeanStd.Err.Std.Dev.[95%Conf.Interval]---------+--------------------------------------------------------------------x1
14、87.875.76619422.1671246.0632399.686761x2
15、810.707106828.32795811
16、.67204---------+--------------------------------------------------------------------diff
17、8-2.1251.0763283.044316-4.670111.4201115------------------------------------------------------------------------------mean(diff)=mean(x1-x2)t=-1.9743Ho:mean(diff)=0degreesoffreedom=7Ha:mean(
18、diff)<0Ha:mean(diff)!=0Ha:mean(diff)>0Pr(T
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