# Introduction to Data Science HW 4 ##### Copyright Jeffrey Stanton, Jeffrey Saltz, and Jasmina Tacheva ```{r} # Enter your name here: ``` ### Attribution statement: (choose only one and delete the...

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# Introduction to Data Science HW 4
##### Copyright Jeffrey Stanton, Jeffrey Saltz, and Jasmina Tacheva
```{r}
# Enter your name here:
```
### Attribution statement: (choose only one and delete the rest)
```{r}
# 1. I did this homework by myself, with help from the book and the professor.
# 2. I did this homework with help from the book and the professor and these Internet sources:
# 3. I did this homework with help from but did not cut and paste any code.
```
Reminders of things to practice from previous weeks:
Descriptive statistics:     mean( ) max( ) min( )
Coerce to numeric:        as.numeric( )
## Part 1: Use the Starter Code
Below, I have provided a starter file to help you.
Each of these lines of code **must be commented** (the comment must that explains what is going on, so that I know you understand the code and results).
```{r}
li
ary(jsonlite)
dataset <- url("https:
intro-datascience.s3.us-east-2.amazonaws.com
ole.json")
eadlines <- jsonlite::fromJSON(dataset)
df <- readlines$objects$person
```
A.    Explore the **df** dataframe (e.g., using head() or whatever you think is best).
```{r}
```
B.    Explain the dataset
o    What is the dataset about?
o    How many rows are there and what does a row represent?
o    How many columns and what does each column represent?
```{r}
```
C. What does running this line of code do? Explain in a comment:
```{r}
vals <- substr(df$birthday,1,4)
```
D. Create a new attribute 'age' - how old the person is
**Hint:** You may need to convert it to numeric first.
```{r}
```
E. Create a function that reads in the role json dataset, and adds the age attribute to the dataframe, and returns that dataframe
```{r}
```
F. Use (call, invoke) the function, and store the results in df
```{r}
```
## Part 2: Investigate the resulting dataframe 'df'
A.    How many senators are women?
```{r}
```
B.    How many senators have a YouTube account?
```{r}
```
C.     How many women senators have a YouTube account?
```{r}
```
D.    Create a new dataframe called **youtubeWomen** that only includes women senators who have a YouTube account.
```{r}
```
E.    Make a histogram of the **age** of senators in **youtubeWomen**, and then another for the senetors in **df**. Add a comment describing the shape of the distributions.
```{r}
```

hw4-intro-to-data-science-chmeruqg.rmd

Answered 11 days After Nov 04, 2021

Solution

Mohd answered on Nov 07 2021

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# Introduction to Data Science HW 4 ##### Copyright Jeffrey Stanton, Jeffrey Saltz, and Jasmina Tacheva ```{r} # Enter your name here: ``` ### Attribution statement: (choose only one and delete the...

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