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数据归一化算法

2017-10-12 MedSci MedSci原创

数据标准化(归一化)处理是数据挖掘的一项基础工作,不同评价指标往往具有不同的量纲和量纲单位,这样的情况会影响到数据分析的结果,为了消除指标之间的量纲影响,需要进行数据标准化处理,以解决数据指标之间的可比性。原始数据经过数据标准化处理后,各指标处于同一数量级,适合进行综合对比评价。 数据归一化? 数据标准化(归一化)处理是在数据挖掘中的一项常见的预处理任务,很多情况下当你在数据预处理时都会浮现出

数据标准化(归一化)处理是数据挖掘的一项基础工作,不同评价指标往往具有不同的量纲和量纲单位,这样的情况会影响到数据分析的结果,为了消除指标之间的量纲影响,需要进行数据标准化处理,以解决数据指标之间的可比性。原始数据经过数据标准化处理后,各指标处于同一数量级,适合进行综合对比评价。 数据归一化? 数据标准化(归一化)处理是在数据挖掘中的一项常见的预处理任务,很多情况下当你在数据预处理时都会浮现出一个问题,是不是要进行数据标准化处理? 一般来说,数据归一化后有一个很明显的优点,最优解的寻优过程明显会变得平缓,更容易正确的收敛到最优解。 归一化前 归一化后 以下是常用的归一化方法: 一、min-max标准化(Min-Max Normalization),也称0-1标准化(0-1 normalization) 也叫离差标准化,是对原始数据的线性变换,使结果落到[0,1]区间,转换函数如下:也称为离差标准化,是对原始数据的线性变换,使结果值映射到[0 - 1]之间。转换函数如下: 其中max为样本数据的最大值,min为样本数据的最小值。这种方法有个缺陷就是当有新数据加入时,可能导致max和min

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    2017-10-13 Y—xianghai

    学习了新知识

    0

  2. [GetPortalCommentsPageByObjectIdResponse(id=252460, encodeId=18ef252460b6, content=学习了新知识, beContent=null, objectType=article, channel=null, level=null, likeNumber=79, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20201006/4db877c2887649beb09cb5effd0b38c7/916f66edd48a4e77b20ebc3e14b6e45c.jpg, createdBy=141e1980133, createdName=Y—xianghai, createdTime=Fri Oct 13 08:04:50 CST 2017, time=2017-10-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=252418, encodeId=7940252418b9, content=谢谢分享.学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=107, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo6Nx0VGA4QMDzOP8oAgnV4h51EjSfehJ9QxyiaSmw8PB56BhY8KXFSxHCibXrzcy4abrzSibXQPxJ9kzrLcJyhhB8a/0, createdBy=1d3b1672603, createdName=明月清辉, createdTime=Fri Oct 13 07:12:27 CST 2017, time=2017-10-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=252384, encodeId=b71a25238425, content=学习一下谢谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=91, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzaiabIFicf63hKvVMjL6aJlx4yX4UcXmzX9DyibCRcicq0QtCRWMaQKh8MYjE1D3EKUBopgiaGWYuqbeR/0, createdBy=0c2b1999806, createdName=三生有幸9135, createdTime=Fri Oct 13 06:14:20 CST 2017, time=2017-10-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=252346, encodeId=70a425234682, content=原始数据经过数据标准化处理后.各指标处于同一数量级.适合进行综合对比评价., beContent=null, objectType=article, channel=null, level=null, likeNumber=76, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7cJ6ejWUr2nIia8qOvAKNdLHr32Df6G8iaoaOx6pHaoiacwp26DaslxZHCGbibZhhCGven4rvmWP60GahtzgFjgCjR/0, createdBy=6b111703011, createdName=有备才能无患, createdTime=Thu Oct 12 23:13:34 CST 2017, time=2017-10-12, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=252334, encodeId=b26c252334ed, content=学习了.谢谢., beContent=null, objectType=article, channel=null, level=null, likeNumber=91, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/xkvRjYnJzzRJ2R0y7VhicibvkjPWHjIMmu4ZpKnE9cWAu4lVicS3uDUCfF4M4JWvrkrYfpb2KehPV0Ee29tPqyPEebBUibiaKhnvD/0, createdBy=f8412001184, createdName=惠映实验室, createdTime=Thu Oct 12 22:52:09 CST 2017, time=2017-10-12, status=1, ipAttribution=)]
    2017-10-13 明月清辉

    谢谢分享.学习了

    0

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    2017-10-13 三生有幸9135

    学习一下谢谢分享

    0

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    2017-10-12 有备才能无患

    原始数据经过数据标准化处理后.各指标处于同一数量级.适合进行综合对比评价.

    0

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    2017-10-12 惠映实验室

    学习了.谢谢.

    0

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