Key Concepts

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Summary Statistics in R

ggplot() Initializes a ggplot Object

ggplot2 Aesthetics

Creating Regression Models in R

Making Predictions from Regression Objects in R

Summary Statistics in R

## AVERAGE
mean(dat) #mean
median(dat) #median

## RANGE
min(dat) #minimum value
max(dat) #maximum value
range(dat) #minimum and maximum

## SPREAD
sd(dat) #standard deviation
var(dat) #variance

## FREQUENCY
table(dat) #frequency of each value

Because R is mainly a statistical processing software, summary statistics come standard with base R functionality.

  • Use mean() and median() to calculate average of a vector.
  • Use min(), max(), and range() to see the range of a vector.
  • Use sd() or var() to calculate the spread of a vector.
  • Use table() to view the frequency of each value in a vector.