Types of variables I
The variable can assume any value along some underlying continuum
What are continuous variables
X increases and Y increases
What is a positive correlation
A correlation between two nominal variables
Another name for a categorical variable
What is a nominal variable
Interval and ratio levels
What are continuous variables
X decreases and Y decreases
What is a positive correlation
A correlation between nominal and ordinal variables
What is a rank biserial coefficient
The difference between a nominal and an ordinal variable
What is ordinal variables are ordered and nominal variables are not
An example of this type of variable is race (black and white)
What are categorical variables
X increases and Y decreases
What is a negative correlation
What is a point biserial correlation
A variable that measures education: high school diploma, some college, college degree, graduate degree, terminal degree
What is an ordinal variable
Age is an example of this type of variable
X decreases and y increases
What is a negative correlation
A correlation between two ordinal variables
What is the Spearman rank coefficient
Hair color
Political affiliation is an example of this type of variable
What is a categorical variable
A correlation between two variables is also called this.
What is a bivariate correlation
A correlation between two interval variables
What is a Pearson correlation coefficient
A variable where the only options are yes or no
What is a binary variable.