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SPSS软件应用:重复测量数据的统计方法

2015-04-23 MedSci MedSci原创

重复测量设计,即对一组或多组受试对象,在k个(k≥2)不同的时间点上,从每个人体(或样本)上重复观测同一个指标的具体取值的设计。如临床研究中,需要观察患者在不同时间的某些生理、生化或病理指标的变化趋势,或治疗干预后不同时间或疗程的疗效特点,就要进行重复测量设计。重复测量数据间存在相关性,不符合方差分析要求,所以重复测量数据资料需要采用专门的统计分析方法,该方法也是近代统计学研究的热点之一。对于重复

重复测量设计,即对一组或多组受试对象,在k个(k≥2)不同的时间点上,从每个人体(或样本)上重复观测同一个指标的具体取值的设计。如临床研究中,需要观察患者在不同时间的某些生理、生化或病理指标的变化趋势,或治疗干预后不同时间或疗程的疗效特点,就要进行重复测量设计。重复测量数据间存在相关性,不符合方差分析要求,所以重复测量数据资料需要采用专门的统计分析方法,该方法也是近代统计学研究的热点之一。

对于重复测量数据(临床上常称纵向监测数据),实质上每个受试对象的观察结果是多次重复测量结果的连线,统计分析的目的是比较这些连线变化趋势的特征。重复测量试验数据的方差分析需要考虑两个因素,一是处理分组,二是测量时间。可采用的统计分析方法:1. 多元方差分析方法;2. 重复测量数据的方差分析。

重复测量数据的变异由两大部分组成。一是观察对象间差异,二是重复测量间差异。观察对象间差异包括处理组间差异和观察对象个体间变异两部分;重复测量间差异包括测量时间之间差异、处理与测量时间的交互作用和组内误差三个部分。因此,重复测量数据的总变异可分解为处理组、测量时间、处理组与测量时间的交互作用、观察对象间随机误差以及重复测量误差等五个部分。

重复测量资料统计前提条件是首先要求样本是随机的,除了满足一般方差分析条件外,特别强调满足协方差阵球形性——球形检验。球形检验(Mauchly):如果P值大于α (如果α=0.05,即p>0.05),说明协方差阵的球对称性质得到满足。若球对称性得不到满足,方差分析的F值是有偏的,会增大Ⅰ类错误的概率,则需校正。否则,必须对与时间有关的F统计量的分子和分母自由度进行调整,减少Ⅰ类错误的概率。调整系数为:ε(epsilon)。

SPSS操作示例

 

SPSS: Analyze » General Linear Model » Repeated Measures

 

选择重复测量方法

 

指定对应的测量值
 


选择Post Hoc

 

选择Model

 

选择Option

 


五次重复测量量的变量名

 

分组变量情况

 

各组各个时间点的详细数据描述

 

结果解读与展示

 

注:各个时间点存在性差异,而且与组别交互中,也存在显著性差异。

球形检验结果
 


组内因素一元方差分析检验结果

 

注:不同时间点存在显著性差异,不同组别对各个时间点的结果存在影响。

各重复测量间变化趋势的分析
 


注:不满足线形和二次方趋势;勉强拟合三次或四次曲线,但仅5次测量,要慎重采用。

组间效应的方法分析结果
 


注:组间比较无显著性差异。

两两比较结果
 


五次测量的均数图
 


结果
 


结论:该治疗方法对三组糖尿病患者的糖化血红蛋白的降低无明显差异。

重复测量数据采用一般线性模型(GLM)方法进行测量,这是使用极为广泛的方法。不仅能做多个因素,多个水平的统计,还能控制协变量,从而得出更可靠的结果。甚至临床上多组之间比较,也更倾向采用GLM,而不是ANOVA方法。

虽然GLM的统计理论很复杂,但是作为临床医生更重要的是识别统计方法,合理应用,以及合理解读结果即可,不必吃透复杂的统计原理。重复测量数据采用一般线性模型(GLM)方法,今后运用会越来越广泛,值得大家重视。MedSci


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    2019-11-04 LiuWJ9713

    怎么样才可以收藏起来

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  2. [GetPortalCommentsPageByObjectIdResponse(id=374783, encodeId=667a3e478313, content=怎么样才可以收藏起来, beContent=null, objectType=article, channel=null, level=null, likeNumber=101, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cdnapi.center.medsci.cn/medsci/head/2019/11/04/baaa7d6b138d2a8cf3bdd198359a195f.jpg, createdBy=f1d65177222, createdName=LiuWJ9713, createdTime=Mon Nov 04 10:12:30 CST 2019, time=2019-11-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=374238, encodeId=c6613e423860, content=写的真好, beContent=null, objectType=article, channel=null, level=null, likeNumber=114, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cdnapi.center.medsci.cn/medsci/head/2019/10/21/e031c1d6c6115cbe1737b2149e602c1d.jpg, createdBy=3c105212218, createdName=147612bem32暂无昵称, createdTime=Tue Oct 22 12:59:12 CST 2019, time=2019-10-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=63824, encodeId=090763824c8, content=有用, beContent=null, objectType=article, channel=null, level=null, likeNumber=137, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=45101626056, createdName=忠诚向上, createdTime=Tue Feb 09 21:44:00 CST 2016, time=2016-02-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=29802, encodeId=6b382980235, content=结果解读要能详细点就更好了,赞一个, beContent=null, objectType=article, channel=null, level=null, likeNumber=195, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo6lR0HdZibhWZ3RhdaUDK6KyHGK2SicUtCduBWvF8hm7GFsXwViaPMPK97jxoI2XTaHOkOtJADxRrqzfrFIK5UtjJ5/0, createdBy=73f21396495, createdName=yoga2008, createdTime=Sun Jun 28 22:19:00 CST 2015, time=2015-06-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=25218, encodeId=136d252185e, content=这个栏目很棒,对于医师的统计学有很大的帮助!多举几个例子就更好了!, beContent=null, objectType=article, channel=null, level=null, likeNumber=144, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=97a31454959, createdName=leegreentree, createdTime=Thu May 28 22:46:00 CST 2015, time=2015-05-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=22456, encodeId=4de72245655, content=已收藏, beContent=null, objectType=article, channel=null, level=null, likeNumber=132, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=ee0d1618732, createdName=huaxipanxing, createdTime=Sat May 02 22:35:00 CST 2015, time=2015-05-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1542966, encodeId=1e0d1542966d0, content=<a href='/topic/show?id=3f53e894718' target=_blank style='color:#2F92EE;'>#统计方法#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=99, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=78947, encryptionId=3f53e894718, topicName=统计方法)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=127213510199, createdName=12498761m60暂无昵称, createdTime=Sat Apr 25 03:05:00 CST 2015, time=2015-04-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=21818, encodeId=3fd121818a5, content=好文章啊, beContent=null, objectType=article, channel=null, level=null, likeNumber=111, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=36a81612921, createdName=xiaoai5777, createdTime=Thu Apr 23 22:27:00 CST 2015, time=2015-04-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=21807, encodeId=a3ae2180e44, content=收藏, beContent=null, objectType=article, channel=null, level=null, likeNumber=125, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=8d891622183, createdName=jiaotangtang, createdTime=Thu Apr 23 20:28:00 CST 2015, time=2015-04-23, status=1, ipAttribution=)]
    2019-10-22 147612bem32暂无昵称

    写的真好

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    2016-02-09 忠诚向上

    有用

    0

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    2015-06-28 yoga2008

    结果解读要能详细点就更好了,赞一个

    0

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    2015-05-28 leegreentree

    这个栏目很棒,对于医师的统计学有很大的帮助!多举几个例子就更好了!

    0

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    2015-05-02 huaxipanxing

    已收藏

    0

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  8. [GetPortalCommentsPageByObjectIdResponse(id=374783, encodeId=667a3e478313, content=怎么样才可以收藏起来, beContent=null, objectType=article, channel=null, level=null, likeNumber=101, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cdnapi.center.medsci.cn/medsci/head/2019/11/04/baaa7d6b138d2a8cf3bdd198359a195f.jpg, createdBy=f1d65177222, createdName=LiuWJ9713, createdTime=Mon Nov 04 10:12:30 CST 2019, time=2019-11-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=374238, encodeId=c6613e423860, content=写的真好, beContent=null, objectType=article, channel=null, level=null, likeNumber=114, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cdnapi.center.medsci.cn/medsci/head/2019/10/21/e031c1d6c6115cbe1737b2149e602c1d.jpg, createdBy=3c105212218, createdName=147612bem32暂无昵称, createdTime=Tue Oct 22 12:59:12 CST 2019, time=2019-10-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=63824, encodeId=090763824c8, content=有用, beContent=null, objectType=article, channel=null, level=null, likeNumber=137, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=45101626056, createdName=忠诚向上, createdTime=Tue Feb 09 21:44:00 CST 2016, time=2016-02-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=29802, encodeId=6b382980235, content=结果解读要能详细点就更好了,赞一个, beContent=null, objectType=article, channel=null, level=null, likeNumber=195, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo6lR0HdZibhWZ3RhdaUDK6KyHGK2SicUtCduBWvF8hm7GFsXwViaPMPK97jxoI2XTaHOkOtJADxRrqzfrFIK5UtjJ5/0, createdBy=73f21396495, createdName=yoga2008, createdTime=Sun Jun 28 22:19:00 CST 2015, time=2015-06-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=25218, encodeId=136d252185e, content=这个栏目很棒,对于医师的统计学有很大的帮助!多举几个例子就更好了!, beContent=null, objectType=article, channel=null, level=null, likeNumber=144, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=97a31454959, createdName=leegreentree, createdTime=Thu May 28 22:46:00 CST 2015, time=2015-05-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=22456, encodeId=4de72245655, content=已收藏, beContent=null, objectType=article, channel=null, level=null, likeNumber=132, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=ee0d1618732, createdName=huaxipanxing, createdTime=Sat May 02 22:35:00 CST 2015, time=2015-05-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1542966, encodeId=1e0d1542966d0, content=<a href='/topic/show?id=3f53e894718' target=_blank style='color:#2F92EE;'>#统计方法#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=99, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=78947, encryptionId=3f53e894718, topicName=统计方法)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=127213510199, createdName=12498761m60暂无昵称, createdTime=Sat Apr 25 03:05:00 CST 2015, time=2015-04-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=21818, encodeId=3fd121818a5, content=好文章啊, beContent=null, objectType=article, channel=null, level=null, likeNumber=111, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=36a81612921, createdName=xiaoai5777, createdTime=Thu Apr 23 22:27:00 CST 2015, time=2015-04-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=21807, encodeId=a3ae2180e44, content=收藏, beContent=null, objectType=article, channel=null, level=null, likeNumber=125, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=8d891622183, createdName=jiaotangtang, createdTime=Thu Apr 23 20:28:00 CST 2015, time=2015-04-23, status=1, ipAttribution=)]
    2015-04-23 xiaoai5777

    好文章啊

    0

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