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Glossary
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I
interquartile range - The difference between the 25th percentile value of a variable and its
interval-level variable - A numerical variable where the distance between each consecutive value of the variable is identical, with no true value of zero.
O
ordinal-level variable - A variable with values that can be rank-ordered but that are not numerical and where the distance between each value of the variable is not identical.
R
range - A statistic calculated by subtracting the lowest value of a variable from its highest value.
S
standard deviation - A statistic that measures the average distance of each value of a variable from the variable’s mean.
V
variability - The level of diversity in a sample or a population, measured through range, interquartile range, variance, or standard deviation.
variance - A statistic that measures the average distance squared of each value in a variable from the variable’s mean; it is the standard deviation squared.
