### 统计代写|回归分析作业代写Regression Analysis代考|STA 4210

statistics-lab™ 为您的留学生涯保驾护航 在代写回归分析Regression Analysis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。我们的专家在代写回归分析Regression Analysis代写方面经验极为丰富，各种代写回归分析Regression Analysis相关的作业也就用不着说。

• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (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|回归分析作业代写Regression Analysis代考|The Trashcan Experiment: Random- $X$ Versus Fixed- X

Here is something you can do (or at least imagine doing) with a group of people. You need a crumpled piece of paper (call it a “ball”), a tape measure, and a clean trashcan. Let each person attempt to throw the ball into the trashcan. The goal of the study is to identify the relationship between success at throwing the ball into the trash can $(Y)$, and distance from the trashcan $(X)$.

In a fixed- $X$ version of the experiment, place markers 5 feet, 10 feet, 15 feet and 20 feet from the trashcan. Have all people attempt to throw the ball into the trashcan from all those distances. Here the $X^{\prime}$ s are fixed because they are known in advance. If you imagine doing another experiment just like this one (say in a different class), then the $X^{\prime}$ s would be the same: $5,10,15$ and 20 .

In a random- $X$ version of the same experiment, you give a person the ball, then tell the person to pick a spot where he or she thinks the probability of making the shot might be around $50 \%$. Have the person attempt to throw the ball into the trashcan multiple times from that distance that he or she selected. Repeat for all people, letting each person pick where they want to stand. Here the $X$ ‘s are random because they are not known in advance. If you imagine doing another experiment just like this one (say in a different class), then the $X$ ‘s would be different because different people will choose different places to stand.

The fixed- $X$ version gives rise to experimental data. In experiments, the experimenter first sets the $X$ and then observes the $Y$. The random- $X$ version gives rise to observational data, where the $X$ ‘s are simply observed, and not controlled by the researcher.

Experimental data are the gold standard, because with observational data the observed effect of $X$ on $Y$ may not be a causal effect. With experimental data, the observed effect of $X$ on $Y$ can be more easily interpreted as a causal effect. Issues of causality in more detail in later chapters.

## 统计代写|回归分析作业代写Regression Analysis代考|The Production Cost Data and Analysis

A company produces items, classically called “Widgets,” in batches. Here $Y=$ production cost for a given job (a batch), and $X=$ the number of “Widgets” produced during that job. It stands to reason that it will cost more to produce more widgets. Regression is used to clarify the nature of this relationship by identifying the additional cost per widget produced (called “variable cost”), and the set-up cost for any job, regardless of the number of widgets produced (called “fixed cost”).

The following $\mathrm{R}$ code (i) reads the data, (ii) draws a scatterplot of the (Widgets, Cost) data, (iii) adds the best-fitting straight line to the data, and (iv) summarizes the results of the linear regression analysis. Do not worry if you do not understand everything at this time; it will all be explained in detail later.

## 广义线性模型代考

statistics-lab作为专业的留学生服务机构，多年来已为美国、英国、加拿大、澳洲等留学热门地的学生提供专业的学术服务，包括但不限于Essay代写，Assignment代写，Dissertation代写，Report代写，小组作业代写，Proposal代写，Paper代写，Presentation代写，计算机作业代写，论文修改和润色，网课代做，exam代考等等。写作范围涵盖高中，本科，研究生等海外留学全阶段，辐射金融，经济学，会计学，审计学，管理学等全球99%专业科目。写作团队既有专业英语母语作者，也有海外名校硕博留学生，每位写作老师都拥有过硬的语言能力，专业的学科背景和学术写作经验。我们承诺100%原创，100%专业，100%准时，100%满意。

## 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。