Data Visualization

Code for quiz 9

1. Load the packages we will use.

library(tidyverse)
library(echarts4r)
library(ggforce)
library(tidyquant)

Question: e_charts-1

Create a bar chart that shows the average hours Americans spend on five activities by year. Use the timeline argument to create an animation that will animate through the years,

• spend_time contains 10 years of data on how many hours americans spend each day on 5 activities

• read it into spend_time

spend_time  <- read.csv("https://estanny.com/static/week8/spend_time.csv")

e_charts-1

Start with spend_time

• THEN group_by year
• THEN create an e_chart that assigns activity to the x-axis and will show activity by year
• THEN use e_timeline_opts to set autoPlay to TRUE
• THEN use e_bar to represent the variable avg_hours with a bar chart
• THEN use e_title to set the main title to ‘Average hours Americans spend per day on each activity’
• THEN remove the legend with e_legend

spend_time  %>%  
  group_by(year)  %>% 
  e_charts(x = activity, timeline = TRUE)  %>% 
  e_timeline_opts(autoPlay = TRUE)  %>% 
  e_bar(serie = avg_hours)  %>% 
  e_title(text = 'Average hours Americans spend per day on each activity')  %>% 
  e_legend(show = FALSE)

Question: echarts-2

Create a line chart for the activities that Americans spend time on.

Start with spend_time

• THEN use mutate to convert year from a number to a string (year-month-day) using mutate
  • first convert year to a string “201X-12-31” using the function paste
    • paste will paste each year to 12 and 31 THEN
• THEN use mutate to convert year from a character object to a date object using the ymd function from the lubridate package. ymd converts dates stored as characters to date objects.
• THEN group_by the variable activity
• THEN initiate an e_charts object with year on the x-axis
• THEN use e_line to add a line to the variable avg_hours
• THEN add a tooltip with e_tooltip
• THEN use e_title to set the main title to ‘Average hours Americans spend per day on each activity’
• THEN use e_legend(top = 40) to move the legend down

Question 3: Modify slide 82

• Create a plot with spend_time data
  • assign year to the x-axis
  • assign avg_hours to the y-axis
  • assign activity to color
• ADD points with geom_point
• ADD geom_mark_ellipse
  • filter on activity == “leisure/sports”
  • description is “Americans spend the most time on leisure/sport”

ggplot(spend_time, aes(x = year, y = avg_hours, color = activity)) +
  geom_point() +
  geom_mark_ellipse(aes(filter = activity == "leisure/sports", description = "Americans spend on average more time each day on leisure/sports than the other activities"))

Question: tidyquant

library(tidyquant)

Retrieve stock price for Amazon, ticker AMZN using tq_get

• from 2019-08-01 to 2020-07-28
• assign output to df

df  <- tq_get("AMZN", get = "stock.prices", from = "2019-08-01", to = "2020-07-28" )

create a plot with the dfdata

• assign date to the x-axis
• assign close to the y-axis
• ADD a line with geom_line
• ADD geom_mark_ellipse
  • filter on a date to mark. Pick a date after looking at the line plot. Include the date in your Rmd code chunk.
  • include a description of something that happened on that date from the pandemic timeline. Include the description in your Rmd code chunk
  • fill the ellipse yellow
• ADD geom_mark_ellipse
  • filter on the date that had the minimum close price. Include the date in your Rmd code chunk.
  • include a description of something that happened on that date from the pandemic timeline. Include the description in your Rmd code chunk
  • color the ellipse red
• ADD labs
  • set the title to Amazon
  • set x to NULL
  • set y to “Closing price per share”
  • set caption to “Source: https://en.wikipedia.org/wiki/Timeline_of_the_COVID-19_pandemic_in_the_United_States”

ggplot(df, aes(x = date, y = close)) +
  geom_line() +
  geom_mark_ellipse(aes(filter = date == "2020-06-15", description = "steadier incline"), fill = "yellow") +
  geom_mark_ellipse(aes(filter = date == "2020-03-16", description = "minimum"), fill = "red") +
  labs(title = "Amazon", 
       x = NULL, 
       y = "closing price per share", 
       caption = "Source: https://en.wikipedia.org/wiki/Timeline_of_the_COVID-19_pandemic_in_the_United_States")

ggsave(filename= "preview.png", 
       path = here::here("_posts", "2021-04-20-data-visualization"))