高大上的lasso回归模型图,怎么来的?

2020-08-15 网络 网络

今天我们来聊一聊lasso回归算法。与预后有关的文章,传统的做法一般会选择多变量cox回归,高级做法自然就是我们今天的lasso分析。

今天我们来聊一聊lasso回归算法。与预后有关的文章,传统的做法一般会选择多变量cox回归,高级做法自然就是我们今天的lasso分析。 首先我们先来几篇文献,看一下lasso最近发的两篇文章,如下: 这两篇文章均是采用了lasso回归的范文。感兴趣的可以自行下载学习,当然今天我们主要是和大家探讨lasso回归的细枝末节,具体体会这个算法的精妙和思想。 Lasso回归本质上就是一种回归分析,我们见到最多的或许就是线性回归,方程如下: 其中x为自变量,y为因变量,线性回归采用一个高维的线性函数来尽可能的拟合所有的数据点,最简单的想法就是最小化函数值与真实值误差的平方,比如假设我们构建一个函数H。 这个时候我们需要保证函数J达到最小,就可以了。 Lasso回归则是在一般线性回归基础上加入了正则项,在保证最佳拟合误差的同时,使得参数尽可能的“简单”,使得模型的泛化能力强。正则项一般采用一,二范数,使得模型更具有泛化性,同时可以解决线性回归中不可逆情况。这个时候你可能不淡定了,你是魔鬼吗?什么是正则项??? 正则项:正则化就是通过对模型参数进行调整(数量和大小),降低模型的复杂度,以达到可以避免

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    2021-08-15 水木丁

    看不到图了?

    0

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    2021-03-19 ms5233340938792882

    学习咯

    0

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    2020-08-15 志明

    图破了。

    0

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    2020-08-27 14818eb4m67暂无昵称

    学习了

    0

  6. [GetPortalCommentsPageByObjectIdResponse(id=1008020, encodeId=4bd31008020f0, content=看不到图了?, beContent=null, objectType=article, channel=null, level=null, likeNumber=68, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20210815/dc17b4ec6963454fbd2dac945e3e899d/19664e63f72f4afcb39b54569640c14d.jpg, createdBy=bb3c5573453, createdName=水木丁, createdTime=Sun Aug 15 10:39:47 CST 2021, time=2021-08-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=949610, encodeId=6c0394961079, content=学习咯 , beContent=null, objectType=article, channel=null, level=null, likeNumber=52, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://q.qlogo.cn/qqapp/1103841572/AFEE88F419F5C2EE00A4D2529684DE09/100, createdBy=94611950576, createdName=ms5233340938792882, createdTime=Fri Mar 19 22:52:40 CST 2021, time=2021-03-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1981482, encodeId=903f198148221, content=<a href='/topic/show?id=02c1405214f' target=_blank style='color:#2F92EE;'>#回归模型#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=42, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=40521, encryptionId=02c1405214f, topicName=回归模型)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=ad7f282, createdName=yang0210, createdTime=Fri Feb 26 04:03:22 CST 2021, time=2021-02-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=809123, encodeId=604c809123bf, content=图破了。, beContent=null, objectType=article, channel=null, level=null, likeNumber=100, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/02/28/889a1910ded7780f3c049b354f1648b7.jpg, createdBy=2a791737770, createdName=志明, createdTime=Sat Aug 15 10:19:40 CST 2020, time=2020-08-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=813848, encodeId=0a2381384827, content=学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=86, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=64245268311, createdName=14818eb4m67暂无昵称, createdTime=Thu Aug 27 08:40:47 CST 2020, time=2020-08-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=809314, encodeId=4fe68093145f, content=看不到图, beContent=null, objectType=article, channel=null, level=null, likeNumber=87, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4b972455532, createdName=1240394fm61暂无昵称, createdTime=Sun Aug 16 09:31:48 CST 2020, time=2020-08-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1047844, encodeId=c80d104e84422, content=梅斯里提供了很多疾病的模型计算公式,赞一个!, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0620, createdName=CHANGE, createdTime=Sat Aug 15 13:03:22 CST 2020, time=2020-08-15, status=1, ipAttribution=)]
    2020-08-16 1240394fm61暂无昵称

    看不到图

    0

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    2020-08-15 CHANGE

    梅斯里提供了很多疾病的模型计算公式,赞一个!

    0

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