Lab Quiz 5 Study Guide

Question 1

Assign variables

Answer 1

y = 2
x = 4
etc

Question 2

Assign multiple values to a variable

Answer 2

variable = c()
Inside add as many values separated by commas

Question 3

Loading datasets

Answer 3

Environment, import dataset, choose dataset to load
or
data(dataset name) for stuff in the R dataset package

Question 4

Subset a portion of data

Answer 4

Variable = subset(filename, dataset == “data”)

Question 5

Take mean of data

Answer 5

mean(x)
mean(variable$data)
Second one for if you already made a variable to be more specific

Question 6

How to make a plot

Answer 6

hist(x)
boxplot(x)
plot(x,y)

Make sure the inside of the parenthesis is dataset$data

For plot, you need to have two dataset$data, the first one being the x-axis

Question 7

How to label axes in a plot

Answer 7

After dataset$data, add:
xlab = “<name>"
ylab = "<name>"
main = "<name>"
Separate everything with commas if you want to have these on a graph</name></name></name>

Question 8

How to find slope and y-intercept for a plot

Answer 8

lm(y ~ x)
This is similar to the plot(,) except with lm instead of ‘plot’, ~ instead of a comma, and reverse the order of y and x. This will give you the slope and intercept of the trendline for the plot

Question 9

How to make a trendline from slope and y-intercept

Answer 9

abline(intercept,slope)
Use the intercept and slope from lm(dataset$data ~ dataset$data)

Question 10

Use dataset from RStudio

Answer 10

data(datasetname)