Rice University
Hyper Stat Online Statistics Textbook: Four Basic Statistics Variables
The basic definitions of four statistics variables - quantitative, qualitative, dependent and independent - are provided here.
University of Glasgow
Steps Statistics Glossary: Discrete Random Variable
An overview of the term "discrete random variable." The site continues with the definition "continuous random variable" so that the user may compare the two.
Rice University
Hyper Stat Online Statistics Textbook: Continuous and Discrete Variables
The basic definitions of continuous and discrete statistics variables are provided here.
University of Glasgow
University of Glasgow: Continuous Random Variable
An overview of the term "continuous random variable." The definition follows immediately after "discrete random variable" so that the user may compare the two.