A variable that can by divided into a finite number of indivisable parts. Continuous variable A variable that can take any value over a range of values and can be meaningfully broken into subparts. Quantitative A description or analysis of a phenomena that involves specific measurement of variables. Levels of measurement Ratio Has the property of an interval scale and has a true zero point. You can have a zero GPA and equal intervals.
Annual income is good too.
Interval A scale in which the intervals between adjacent points are equal. Temperature is a good example of interval data. IQ is good too. You can't have a zero IQ so to speak. The zero is not meaningful.