19th Ave New York, NY 95822, USA

# 统计代写|统计入门代写Introduction to Statistics代考|STA2023 How Can I Use a Matrix to Display Several Correlation Coefficients?

my-assignmentexpert™提供最专业的一站式服务：Essay代写，Dissertation代写，Assignment代写，Paper代写，Proposal代写，Proposal代写，Literature Review代写，Online Course，Exam代考等等。my-assignmentexpert™专注为留学生提供Essay代写服务，拥有各个专业的博硕教师团队帮您代写，免费修改及辅导，保证成果完成的效率和质量。同时有多家检测平台帐号，包括Turnitin高级账户，检测论文不会留痕，写好后检测修改，放心可靠，经得起任何考验！

## 统计代写|统计入门代写Introduction to Statistics代考|How Can I Use a Matrix to Display Several Correlation Coefficients?

single correlation coefficient is always expressed as one value-a numerical index of the strength of the relationship between two, and only two, variables.

If more than two variables are being correlated with one another, then a correlation matrix can help consolidate the information about the data and make the various relationships much easier to understand.

For example, here are some data, and the data table is followed by a matrix that reflects the various correlations that might be computed. Remember that simple Pearson product-moment correlations always reflect the correlation between just two variables.

Here are the data, with each variable named and the possible range in parentheses.

And here is the correlation matrix. These are the correlations between all possible pairs of variables. The number of variables is four, and the possible pairs are four taken two at a time, for a total of six.

As you can see, each cell represents a correlation between two variables. For example, the correlation between grade point average (GPA) and number of hours studying per week is 56 , indicating that the more time spent studying, the higher the GPA is and the higher the GPA, the more time is spent studying.

Each of these values represents only the correlation between two variables. The values along the diagonal are 1 because the correlation between one variable and itself is always 1 .

Since correlations can be expressed as $r_{x y}$ or $r_{y x}$, the cells beneath the diagonal of $1 \mathrm{~s}$ are empty. The correlation between Year in School and score on the Boredom Scale is exactly the same as the correlation between score on the Boredom Scale and Year in School.

## 统计代写|统计入门代写INTRODUCTION TO STATISTICS代考|What Are Some Other Measures of Correlation, and How Are They Used?

The Pearson product-moment correlation is only one way to compute a correlation, and it is most useful when looking at the relationship between two variables that are continuous in nature, that is, variables that can take on any value along a continuum. One example is the number of words spelled correctly on a spelling test.

What about all those other situations in which variables are not continuous and can only have values at specific points on some scale? These include such categorical variables as gender (male or female or yes or no or 1 or 2 ) or party affiliation (Republican, Democrat, or other).

The following chart shows what type of correlation to use when you have such sets of variables. In this chart, categorical variables are called nominal, ranked variables are called ordinal, and variables that are continuous are called interval.

Computing these various types of correlations coefficients is beyond the scope of 100 Questions (and Answers) About Statistics, but there are many books and online resources and computer software packages that can help you do such.

## 统计代写|统计入门代写INTRODUCTION TO STATISTICS代 考|WHAT ARE SOME OTHER MEASURES OF CORRELATION, AND HOW ARE THEY USED?

Pearson 积矩相关性只是计算相关性的一种方法，它在龺看本质上连续的两个变量之间的关系时最有用，即可以沿连续统一体取任何值的变量。一个例子是在拼写 测试中拼写正确的单词数量。

Republican, Democrat, orother.

## 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。