Data Science Jeopardy

Tidy Data

100

The number of variables in a tidy data set is equal to...

What is the number of columns?

200

The number of rows in a tidy data set.

What is the number of observations?

300

R package design for exploratory data analysis of rectangular data sets. 

What is Tidyverse?

400

This core member of tidyverse implements the "grammar of graphics" for describing and building graphs.

What is ggplot?

500

This line of code allows you to load tidyverse into your session. 

What is library(tidyverse)?

Data Visualizations

100

Describe the visualization:

ggplot(data=mpg)+
  geom_point(mapping=aes(x=displ, y=hwy, color=class)

What is a scatter plot of displacement vs. high way miles, color coded by class of car?

200

A geometrical object that a plot uses to represent data. 

What is a geom?

300

Every geom has a default stat. This is the default stat of geom_bar. 

What is stat_count or count?

400

This layer of graphics allows you to split your plot into subplots. It is particulartly useful for categorical data. 

What is faceting?

500

This coordinate system function allows you to switch the x and y axes. 

What is coord_flip()?

Data Transformations

100

This tidyverse package provides five key functions that allow you to solve the vast majority of data-manipulation challenges. 

What is dplyr?

200

This dplyr function allows you pick observations by their values

What is filter()?

300

This dplyr funciton allows you to reorder the rows.

What is arrange()?

400

How do you pick all the flights after September?

filter(flights, month>9)

or 

filter(flights, month>=10)

500

You can use this function to determine if a value is missing. 

What is is.na()?

Logical Operators

100

x={1,2,3,4,5}

x>3|x==1

What is <ANSWER VARIES>?

possible answers {1,4,5}

200

This number is (greater than 5 AND even)AND(less than 10 AND a multiple of 3)

What is 6?

300

x={1,2,3,5,7,9}

(x!=2)|even

What is <ANSWER VARIES>?

possible answers:{1,3,5,7,9}

400

filter() only includes rows where the condition is TRUE; it excludes both FALSE and these values...

What are NAs?

500

One day your minimalist friend is visiting, and she presents you with the numbers 2, 3, 4 and 5, and the symbols = and +, and the following tantalizing challenge:  It is possible to use each number and symbol once and only once and end up with a true equation; further, you cannot use any number or symbol not given. How can you do this?

What is <still working on the answer>