1. 决策

1.1 if 条件语句

在许多情况下，你需要根据条件做出决定。

为此，可以使用 if 语句。

例如：

x <- 24
if(x > 10){
    print( "x is greater than 10")
}

1. 欢迎来到 R 语言

你好，我是悦创。

R 语言是应用最广泛的统计编程语言。

而且 R 语言它是数据科学家和分析师的首选。

在本课程中，我们将学习R语言的基础知识，了解如何创建存储和操作数据的程序、以及如何使用各种数据集执行数据分析任务，以及如何使用图形和图表可视化结果。

本课程学习的技能可应用于任何与数据相关的领域，包括金融、数据科学、机器学习等。

Assignment 1 is designed to test your understanding of the skills practiced in weeks 1 through 4:

• creating variables using Python's built-in data types
• converting and checking data types
• using built-in functions
• using conditional statements and loops
• writing functions

Question: 1

What kind of data structure is user_data in the following declaration?

user_data = ("TJ", 24, "artLover123")

Netiquette is essentially rules and norms for interacting with others on the Internet.

We’re here to help with nine simple guidelines for how to be on your best behavior in an online classroom.

Nine netiquette guidelines every online student needs to know.

1. NO YELLING, PLEASE

Prepare for Technological Success

Meet Computer Specifications

In order to participate in this course within Canvas, you should make sure that your technologies meet the minimal basic computer specificationsLinks to an external site..

1. 题目

1. (0 points) Please type your code and answers into Jupyter notebook. All visualizations should be prop-erly labelled. Submit the notebook as a pdf.

2. (3.5 points) Use the bwght dataset from the Wooldridge python module to answer the following question. You can find the documentation for the data online here. Import this data into your notebook.

   (a) (1.5 Points) How many women are in the sample? What proportion of women with a family income higher than $50,000 are smokers? What proportion of women with a family income less than $20,000 are smokers?

   (b) (1 Points) Generate a table of summary statistics for the dataframe. What is the average number of cigarettes smoked in a day? Is the mean a good measure of the typical women’s smoking habits? If no, explain why and if there is a better measure.

   (c) (1 Points) Find the mode of fatheduc in the sample. Why are only 1,192 observations used to compute this statistic?

3. (5.5 points) Use the bwght dataset from the Wooldridge python module to answer the following question.

   (a) (1 point) Generate two different histograms of bwght using Sturge’s and FD binning methods. Explain the strengths and weaknesses of each method when applied to bwght.

   (b) (1 point) Create a histogram of bwght using either sturges or fd to choose the number of bins. Overlay a density curve.

   (c) (2 points) Using a q-q plot, do you believe bwght is approximately normally distributed? Why are why not? What about family income?

   (d) (1.5 points) Create a boxplot conditioning on whether or not the mother was a smoker. Do you observe any differences? If so, what are they?

4. (6 points) Use the bwght dataset from the Wooldridge python module to answer the following question.

   (a) (2 points) Estimate the parameters for the following simple regression:

   $$\large \hat{bwght} = \hat{\beta_0} + \hat{\beta_1} \times packs$$

   report the intercept and slope. What do these tell you about the association between cigarette use and birth weight?

   (b) (2 points) What is the predicted value of birthweight when packs = 0? When packs = 2? What is the interpretation of the intercept?

   (c) (1 point) Verify the residuals of this regression sum (approximately) to zero.

   (d) (1 point) Using a scatter plot, show the observed values against the values predicted by a regression.

Q1

Q2

Q3

Create a list of your favorite 4 movies. Print out the 0th element in the list. Now set the 0th element to be “Star Wars” and try printing it out again.

创建你最喜欢的4部电影的列表。打印列表中的第0个元素。现在将第0个元素设置为“星球大战”，然后再试着打印它。

# 创建一个包含4部电影的列表
favorite_movies = ["Movie1", "Movie2", "Movie3", "Movie4"]

# 打印列表中的第0个元素
print(favorite_movies[0])

# 将第0个元素设置为“星球大战”
favorite_movies[0] = "星球大战"

# 再次打印列表中的第0个元素
print(favorite_movies[0])

Notebook

使用命令行运行 Jupyter Notebook 的具体流程如下：

1. 思考🤔：你想在哪里运行你的项目 or 你想把代码存储在哪里？「确定路径」
2. 启动 CMD：在文件夹上面的路径中，直接输入 cmd 回车「Enter」目标🎯：为了更快速的到达目标路径。（还有多种方法，以后再讲）
3. 确保安装了 Jupyter Notebook：

jupyter notebook

1. 待解决问题🙋

• Pandas 数据，为什么会有 dtype: float64？

公众号：AI悦创【二维码】

Question: 1

In the following code:「D」

size = 20
x = 100
y = 200
ball = Circle(size)
circle.set_position(x, y)

Question 1

Write a function that takes one parameter - a float which represents a temperature in Celsius - and returns a float which represents that temperature in Fahrenheit.

Then, write a function that does the opposite conversion.

Here are the formulas for temperature conversion: