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原创 用相似矩阵的几何意义直观理解PCA降维方法

PCA(主成分分析)是降维中最经典的方法,其推导求解的常用两种方法包括最大方差理论(样本点到超平面的投影都尽可能分开)以及最小平方误差理论(样本点到超平面的距离都足够近),以上两种方法都需要进行严格意义上的数学推导,而本文想从另一个角度——相似矩阵的几何意义——直观理解PCA坐标变换的选取。1.相似矩阵的几何意义以三维向量空间为例,任何一个向量v⃗\vec{v}v都可以用一组基向量的某个线性组...

2019-05-12 15:40:23 3100 1

原创 通俗易懂理解特征归一化对梯度下降算法的重要性

这里写自定义目录标题欢迎使用Markdown编辑器新的改变功能快捷键合理的创建标题,有助于目录的生成如何改变文本的样式插入链接与图片如何插入一段漂亮的代码片生成一个适合你的列表创建一个表格设定内容居中、居左、居右SmartyPants创建一个自定义列表如何创建一个注脚注释也是必不可少的KaTeX数学公式新的甘特图功能,丰富你的文章UML 图表FLowchart流程图导出与导入导出导入欢迎使用Ma...

2019-05-04 16:51:58 2733

数据分析实战(作者: [ 日] 酒卷隆治 里洋平 )

本书由实战经验丰富的两位数据分析师执笔,首先介绍了商业领域里通用的数据分析框架,然后根据该框架,结合8个真实的案例,详细解说了通过数据分析解决各种商业问题的流程,让读者在解决问题的过程中学习各种数据分析方法,包括柱状图、交叉列表统计、A/B测试、多元回归分析、逻辑回归分析、主成分分析、聚类、决策树分析、机器学习等。特别是书中使用的数据都是未经清洗的原始数据,能够让读者了解真实的数据分析流程,避免纸上谈兵。

2019-05-04

统计分析和数据挖掘应用手册(英文版)

HANDBOOK OF STATISTICAL ANALYSIS AND DATA MINING APPLICATIONS “Great introduction to the real-world process of data mining. The overviews, practical advice, tutorials, and extra DVD material make this book an invaluable resource for both new and experienced data miners.” Karl Rexer, Ph.D. (President and Founder of Rexer Analytics, Boston, Massachusetts, www.RexerA) “Statistical thinking will one day be as necessary for efficient citizenship as the ability to read and write.” H. G. Wells (1866 – 1946) “Today we aren’t quite to the place that H. G. Wells predicted years ago, but society is getting closer out of necessity. Global businesses and organizations are being forced to use statistical analysis and data mining applications in a format that combines art and science–intuition and expertise in collecting and understanding data in order to make accurate models that realistically predict thefuture that lead to informed strategic decisions thus allowing correct actions ensuring success, before it is too late . . . today, numeracy is as essential as literacy. As John Elder likes to say: ‘Go data mining!’ It really does save enormous time and money. For those with the patience and faith to get through the early stages of business understanding and data transformation, the cascade of results can be extremely rewarding.” Gary Miner, March, 2009 HANDBOOK OF STATISTICAL ANALYSIS AND DATA MINING APPLICATIONS ROBERT NISBET Pacific Capital Bankcorp N.A.

2019-05-04

Data Mining: The Textbook (Springer 2015原版超清)

This textbook explores the different aspects of data mining from the fundamentals to the complex data types and their applications, capturing the wide diversity of problem domains for data mining issues. It goes beyond the traditional focus on data mining problems to introduce advanced data types such as text, time series, discrete sequences, spatial data, graph data, and social networks. Until now, no single book has addressed all these topics in a comprehensive and integrated way. The chapters of this book fall into one of three categories: Fundamental chapters: Data mining has four main problems, which correspond to clustering, classification, association pattern mining, and outlier analysis. These chapters comprehensively discuss a wide variety of methods for these problems. Domain chapters: These chapters discuss the specific methods used for different domains of data such as text data, time-series data, sequence data, graph data, and spatial data. Application chapters: These chapters study important applications such as stream mining, Web mining, ranking, recommendations, social networks, and privacy preservation. The domain chapters also have an applied flavor.

2019-04-26

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