interval scale

n. A quantitative scale with magnitude and equal intervals but lacking an absolute zero. The lack of an absolute zero allows interval data to be added or subtracted to compare differences at any point on the scale, but values cannot be multiplied or divided to create meaningful ratios. The Fahrenheit scale is an example of an interval scale as a 10-degree difference at any point on the scale indicates a consistent variance in temperature (equal intervals), but there is no such thing as no temperature (absolute zero). Appropriate calculations of interval data include mean, median, mode, range, and standard deviation.

- BJM