Interquartile Range
Divide a set of data into two groups (high and low) of equal size at the Median if thereis an Even number of data points, or two groups consisting of points on either side of the Median itself plus the Median if there is an Odd number of data points. Findthe Medians of the low and high groups, denoting these first and third quartiles by 
and 
. The interquartile range is then defined by
See also H-Spread, Hinge, Median (Statistics)
- Schiffler Point
- Schinzel Circle
- Schinzel's Hypothesis
- Schinzel's Theorem
- Schisma
- Schlegel Graph
- Schläfli Double Six
- Schläfli Function
- Schläfli Integral
- Schläfli Polynomial
- Schläfli's Formula
- Schläfli's Modular Form
- Schläfli Symbol
- Schlömilch's Function
- Schlömilch's Series
- Schmitt-Conway Biprism
- Schnirelmann Constant
- Schnirelmann Density
- Schnirelmann's Theorem
- Schoenemann's Theorem
- Scholz Conjecture
- Schoolgirl Problem
- Schoute Coaxal System
- Schoute's Theorem
- Schrage's Algorithm