用SPSS Modeler 建立线性回归预测模型

2015-12-28 MedSci MedSci原创

SPSS Modeler 是一组数据挖掘工具,通过这些工具可以采用商业技术快速建立预测性模型, 并将其应用于商业活动,从而改进决策过程。将通过一个理赔欺诈检测的实际商业应用来介绍如何用 IBM SPSS Modeler 建立、分析及应用线性回归分析模型。实际上,医学数据模型与之十分类似。 回归分析(Regression Analysis)是一种统计学上对数据进行分析的方法,主要是希望探讨数据

SPSS Modeler 是一组数据挖掘工具,通过这些工具可以采用商业技术快速建立预测性模型, 并将其应用于商业活动,从而改进决策过程。将通过一个理赔欺诈检测的实际商业应用来介绍如何用 IBM SPSS Modeler 建立、分析及应用线性回归分析模型。实际上,医学数据模型与之十分类似。

回归分析(Regression Analysis)是一种统计学上对数据进行分析的方法,主要是希望探讨数据之间是否有一种特定关系。线性回归分析是最常见的一种回归分析, 它用线性函数来对因变量及自变量进行建模(自变量和因变量都必须是连续型变量), 这种方式产生的模型称为线性模型。线性回归模型由于其运算速度快、直观性强以及参数易于确定等特点, 在实践中应用最为广泛,也是建立预测模型的重要手段之一。

用线性回归建立理赔欺诈检测模型

在本例中,用于建立模型的数据存放在 InsClaim.dat 中,该文件是一个 CSV 格式的数据文件, 存储了某医院以往医疗保险理赔的历史记录。该文件共有 293 条记录,每条记录有 4 个字段, 分别是 ASG(疾病严重程度)、AGE(年龄)、LOS(住院天数)和 CLAIM(索赔数额)。 图 1 显示了该数据的部分内容。

图 1. 历史理赔数据文件
历史理赔数据文件

任务与计划

基于已有的数据,我们的任务主要有如下内容:

  • 建立理赔金额预测模型,该模型将基于病人的疾病严重程度、住院天数及年龄预测其索赔金额。
  • 假设模型匹配良好,分析那些与预测误差较大的病人资料。
  • 通过模型来进行索赔欺诈预测。

根据经验及对数据进行的初步分析(这个数据初步分析可以通过 IBM SPSS Modeler 的功能实现,此处不是重点, 故不做深入介绍),可以猜测理赔金额与疾病严重程度、住院天数以及年龄存在线性相关关系,因此我们将首先 选用线性回归模型进行建模,因此可以得到下面这样一个初步计划:

  • 应用线性回归分析来建立模型。
  • 如果模型匹配度不佳,则可能应用更加复杂的模型,例如神经网络、规则推导等。

基于上面的分析,我们容易得到目标模型的因变量为 CLAIM,自变量为 ASG、AGE 和 LOS。在建立模型之前,我们可以 对该模型进行一些猜测,以下是根据经验能想到的一些假设:

  • 随着住院天数的增加,索赔金额增加
  • 随着疾病严重程度的增加,索赔金额增加
  • 随着年龄的增加,索赔金额增加

在建立好模型后,我们会根据模型来验证或推翻这些假设。

用 IBM SPSS Modeler 创建 stream 文件

根据任务要求,我们在 IBM SPSS Modeler 中建立如图 2 所示的 stream 文件。在该 stream 中,InsClaim.dat 作为数据源节点, 它通过一个类型节点(type)进行数据处理后输入到模型节点(CLAIM),在本例中,输出节点(table)作为一个测试节 点,可以用于查看类型节点处理后产生的数据。

图 2. 理赔预测模型 stream 示例图
理赔预测模型 stream 示例图

设置类型(type)节点

从前面的分析可见,CLAIM 是因变量,在类型节点中须作为目标变量(Target),而其余三个字段(ASG、AGE 和 LOS) 则是自变量,在类型节点中须设置为输入变量(Input)。

需要注意的是,在线性回归分析模型中,要求所有变量(包括自变量和因变量)都是连续类型。 如果数据中有非数字类型,比如 Category 或者 Flag,则需要预先转换为数字型。图 3 显示了类型节点设置的具体情况。

图 3. 类型节点设置图
类型节点设置图

模型节点设置

在设置好类型节点后,我们可以双击 CLAIM 节点,对模型节点进行设置。首先设置 Model 标签页中的选项。 从图 4 可以看到设置的具体信息,Model Name 有自动和定制两种类型,在自动方式下,模型名称自动设置 为目标变量的名字(CLAIM)。本模型的输入信息并没有分组,因此 Use partitioned data 和 Build model for each split 的选择与否并无关系。Method 选项将选择输入字段的选择方式,由于本例中的输入字段较少,可以使用默认的 Enter 模式。 在字段较多的情况下,可以选择 StepWise、Forward 和 Backward 中的一种,它们会采用不同的统计学方式对输入字段进行筛选。 Include constant in equation 选项表示模型中是否包含常量(即截距),在本例中,由于每次理赔会有一个起始额度,因此选中该选项。

图 4. 模型节点的 Model 页设置图
模型节点的 Model 页设置图

在 Expert 页中可以设置一些模型的高级选项。在我们选择了专家模式后,可以设置两个选项内容:

  • Missing Values ——当选中该选项,会忽略那些含有 Missing Value 的记录。 (默认选项,通常应该使用这个选项,除非你非常有经验,清楚知道 Missing Value 对该模型的影响)
  • Singularity tolerance ——用来防止相关变量影响模型准确度。 该值越小,表示相似性越高,也就说明排除的可能性越低。有些统计师倾向于把 该值设置的稍大,比如 .05(在本例中是 .0001)
通过本文,您了解了如何通过 IBM SPSS Modeler 创建基于线性回归分析的预测分析模型,并了解到如何设置、 创建、分析、理解和应用模型。这样,您就可以通过 IBM SPSS Modeler 简易的数据流风格方便快速地创建和应用一个模型。

本文中的理赔欺诈预测模型示例,用一个完整的流文件演示了怎样设置数据数据;怎样设置模型参数; 怎样通过 IBM SPSS Modeler 提供的数据分析和理解模型;并介绍了如何分析奇异点。通过此示例,您可以立刻就动手创建自己的模型。

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    2016-11-04 qingrejiedu
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topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfNLvzZhgPxRiaKicWybj5Q5KN7PWibALciaJ4W5bZwTlDSFRibFu87125pCq0IXePrC0mpbiasADRqL4NcjUoyQCT9De/0, createdBy=7c7e1636498, createdName=wzf990214, createdTime=Tue Dec 29 07:02:00 CST 2015, time=2015-12-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=50086, encodeId=ad83500865f, content=有意思, beContent=null, objectType=article, channel=null, level=null, likeNumber=84, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfNLvzZhgPxRiaKicWybj5Q5KN7PWibALciaJ4W5bZwTlDSFRibFu87125pCq0IXePrC0mpbiasADRqL4NcjUoyQCT9De/0, createdBy=7c7e1636498, createdName=wzf990214, createdTime=Tue Dec 29 07:01:00 CST 2015, time=2015-12-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=50077, encodeId=4fb2500e71b, content=学习le, beContent=null, objectType=article, channel=null, level=null, likeNumber=82, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7cde98330, createdName=milkshark, createdTime=Tue Dec 29 06:44:00 CST 2015, time=2015-12-29, status=1, ipAttribution=)]
    2016-01-20 miaotao

    Mark

    0

  4. 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channel=null, level=null, likeNumber=82, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7cde98330, createdName=milkshark, createdTime=Tue Dec 29 06:44:00 CST 2015, time=2015-12-29, status=1, ipAttribution=)]
  5. 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topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfNLvzZhgPxRiaKicWybj5Q5KN7PWibALciaJ4W5bZwTlDSFRibFu87125pCq0IXePrC0mpbiasADRqL4NcjUoyQCT9De/0, createdBy=7c7e1636498, createdName=wzf990214, createdTime=Tue Dec 29 07:02:00 CST 2015, time=2015-12-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=50086, encodeId=ad83500865f, content=有意思, beContent=null, objectType=article, channel=null, level=null, likeNumber=84, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfNLvzZhgPxRiaKicWybj5Q5KN7PWibALciaJ4W5bZwTlDSFRibFu87125pCq0IXePrC0mpbiasADRqL4NcjUoyQCT9De/0, createdBy=7c7e1636498, createdName=wzf990214, createdTime=Tue Dec 29 07:01:00 CST 2015, time=2015-12-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=50077, encodeId=4fb2500e71b, content=学习le, beContent=null, objectType=article, channel=null, level=null, likeNumber=82, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7cde98330, createdName=milkshark, createdTime=Tue Dec 29 06:44:00 CST 2015, time=2015-12-29, status=1, ipAttribution=)]
    2015-12-29 qingfengqishi5

    收藏了

    0

  6. 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topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfNLvzZhgPxRiaKicWybj5Q5KN7PWibALciaJ4W5bZwTlDSFRibFu87125pCq0IXePrC0mpbiasADRqL4NcjUoyQCT9De/0, createdBy=7c7e1636498, createdName=wzf990214, createdTime=Tue Dec 29 07:02:00 CST 2015, time=2015-12-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=50086, encodeId=ad83500865f, content=有意思, beContent=null, objectType=article, channel=null, level=null, likeNumber=84, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfNLvzZhgPxRiaKicWybj5Q5KN7PWibALciaJ4W5bZwTlDSFRibFu87125pCq0IXePrC0mpbiasADRqL4NcjUoyQCT9De/0, createdBy=7c7e1636498, createdName=wzf990214, createdTime=Tue Dec 29 07:01:00 CST 2015, time=2015-12-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=50077, encodeId=4fb2500e71b, content=学习le, beContent=null, objectType=article, channel=null, level=null, likeNumber=82, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7cde98330, createdName=milkshark, createdTime=Tue Dec 29 06:44:00 CST 2015, time=2015-12-29, status=1, ipAttribution=)]
    2015-12-29 鲜花飞鸟

    这是给保险公司用的么

    0

  7. 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topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfNLvzZhgPxRiaKicWybj5Q5KN7PWibALciaJ4W5bZwTlDSFRibFu87125pCq0IXePrC0mpbiasADRqL4NcjUoyQCT9De/0, createdBy=7c7e1636498, createdName=wzf990214, createdTime=Tue Dec 29 07:02:00 CST 2015, time=2015-12-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=50086, encodeId=ad83500865f, content=有意思, beContent=null, objectType=article, channel=null, level=null, likeNumber=84, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfNLvzZhgPxRiaKicWybj5Q5KN7PWibALciaJ4W5bZwTlDSFRibFu87125pCq0IXePrC0mpbiasADRqL4NcjUoyQCT9De/0, createdBy=7c7e1636498, createdName=wzf990214, createdTime=Tue Dec 29 07:01:00 CST 2015, time=2015-12-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=50077, encodeId=4fb2500e71b, content=学习le, beContent=null, objectType=article, channel=null, level=null, likeNumber=82, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7cde98330, createdName=milkshark, createdTime=Tue Dec 29 06:44:00 CST 2015, time=2015-12-29, status=1, ipAttribution=)]
    2015-12-29 wzf990214

    不错哦

    0

  8. [GetPortalCommentsPageByObjectIdResponse(id=1981885, encodeId=1e331981885d0, content=<a href='/topic/show?id=ffd61206861' target=_blank style='color:#2F92EE;'>#model#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12068, encryptionId=ffd61206861, topicName=model)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2b9b368, createdName=qingrejiedu, createdTime=Fri Nov 04 21:05:00 CST 2016, time=2016-11-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1701384, encodeId=dee51e01384b2, content=<a href='/topic/show?id=214ee756845' target=_blank style='color:#2F92EE;'>#线性回归#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=44, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=77568, encryptionId=214ee756845, topicName=线性回归)], attachment=null, authenticateStatus=null, createdAvatar=null, 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topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfNLvzZhgPxRiaKicWybj5Q5KN7PWibALciaJ4W5bZwTlDSFRibFu87125pCq0IXePrC0mpbiasADRqL4NcjUoyQCT9De/0, createdBy=7c7e1636498, createdName=wzf990214, createdTime=Tue Dec 29 07:02:00 CST 2015, time=2015-12-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=50086, encodeId=ad83500865f, content=有意思, beContent=null, objectType=article, channel=null, level=null, likeNumber=84, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfNLvzZhgPxRiaKicWybj5Q5KN7PWibALciaJ4W5bZwTlDSFRibFu87125pCq0IXePrC0mpbiasADRqL4NcjUoyQCT9De/0, createdBy=7c7e1636498, createdName=wzf990214, createdTime=Tue Dec 29 07:01:00 CST 2015, time=2015-12-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=50077, encodeId=4fb2500e71b, content=学习le, beContent=null, objectType=article, channel=null, level=null, likeNumber=82, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7cde98330, createdName=milkshark, createdTime=Tue Dec 29 06:44:00 CST 2015, time=2015-12-29, status=1, ipAttribution=)]
    2015-12-29 wzf990214

    赞一个

    0

  9. [GetPortalCommentsPageByObjectIdResponse(id=1981885, encodeId=1e331981885d0, content=<a href='/topic/show?id=ffd61206861' target=_blank style='color:#2F92EE;'>#model#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12068, encryptionId=ffd61206861, topicName=model)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2b9b368, createdName=qingrejiedu, createdTime=Fri Nov 04 21:05:00 CST 2016, time=2016-11-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1701384, encodeId=dee51e01384b2, content=<a href='/topic/show?id=214ee756845' target=_blank style='color:#2F92EE;'>#线性回归#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=44, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=77568, encryptionId=214ee756845, topicName=线性回归)], attachment=null, authenticateStatus=null, createdAvatar=null, 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channel=null, level=null, likeNumber=82, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7cde98330, createdName=milkshark, createdTime=Tue Dec 29 06:44:00 CST 2015, time=2015-12-29, status=1, ipAttribution=)]
    2015-12-29 wzf990214

    有意思

    0

  10. 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