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. Ordinal Items are ranked on a continuum. A good example of ordinal data is the college football polls.