### 统计代写|数据可视化代写Data visualization代考|INFO2001

statistics-lab™ 为您的留学生涯保驾护航 在代写数据可视化Data visualization方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写数据可视化Data visualization代写方面经验极为丰富，各种代写数据可视化Data visualization相关的作业也就用不着说。

• Statistical Inference 统计推断
• Statistical Computing 统计计算
• Advanced Probability Theory 高等概率论
• Advanced Mathematical Statistics 高等数理统计学
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 统计代写|数据可视化代写Data visualization代考|The Broad Street Pump

Snow’s opportunity to test his theory came with the new eruption that began toward the end of August in 1854. His celebrated 1855 report, On the Mode of Communication of Cholera, ${ }^{16}$ describes it dramatically:
The most terrible outbreak of cholera which ever occurred in this kingdom, is probably that which took place in Broad Street, Golden Square, and the adjoining streets, a few weeks ago. Within two hundred and fifty yards of the spot where Cambridge Street joins Broad Street, there were upwards of five hundred fatal attacks of cholera in ten days. The mortality in this limited area probably equals any that was ever caused in this country, even by the plague; and it was much more sudden, as the greater number of cases terminated in a few hours. (p. 38)

The full story of Snow’s discovery of the waterborne cause of cholera has been told in rich detail many times, by medical historians ${ }^{17}$ and cartographers, ${ }^{18}$ and it was brought to the attention of statisticians and those interested in the history of data visualization by Edward Tufte. ${ }^{19}$

The short, if slightly apocryphal, version of this story is that, during the outbreak of cholera in Soho in 1854, Snow created a dot map of the locations of deaths and immediately noticed that they clustered on Broad Street, near the site of one of the public pumps from which residents drew their water. This narrative continues: Snow recognized that cases of death were strongly associated with drinking water from this pump. He petitioned the Board of Guardians of St. James Parish to remove the pump handle, whereupon the cholera epidemic subsided.

## 统计代写|数据可视化代写Data visualization代考|The Neighborhoods Map

The version of Snow’s map shown in Figure $4.7$ is the most famous, but a second version is more interesting graphically and scientifically. The Cholera Inquiry Committee, appointed by the Vestry of St. James, submitted its report on July 25, 1855. ${ }^{22}$ The section titled “Dr. Snow’s Report” contained a new map that attempted a more detailed and direct visual analysis of the association of death with the Broad Street pump.

This new map, shown in Figure 4.8, states and tests a geospatial hypothesis: people are most likely to draw their water from the nearest pump (by walking distance). The outlined region in this map “shews the various points which have been found by careful measurement to be at an equal distance by the nearest road from the pump in Broad Street and the surrounding pumps.” 23

If the source of the outbreak was indeed the Broad Street pump, one should expect to find the highest concentration of deaths within this area, and also a low prevalence outside it. He stated his conclusion as “it will be observed that the deaths either very much diminish, or cease altogether, at every point where it becomes decidedly nearer to send to another pump than to the one in Broad street.” 24

The final explanation for the source of the outbreak came slightly later, through the work of Reverend Henry Whitehead, the curate at a local church and a member of the Cholera Inquiry Committee. He identified the first (“index”) case as the death of a five-month-old infant, Frances Lewis, whose family lived at 40 Broad Street, immediately adjacent to the pump. When severe diarrhea struck the child, her mother, Sarah Lewis, soaked the diapers and emptied the pails into the cesspool at the front of their house, only three feet from the well. Unfortunately, the cesspool walls had decayed and the effluent flowed directly into the pump well. Thomas Lewis, the baby’s father and a local constable, suffered a fatal attack of the disease on September 8, the same day that the pump handle was removed.

## 有限元方法代写

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## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。