This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.

# QuartileDeviation

 QuartileDeviation[list]gives the quartile deviation or semi-interquartile range of the elements in list. QuartileDeviation[dist]gives the quartile deviation or semi-interquartile range of the symbolic distribution dist.
Quartile deviation for a list of exact numbers:
Quartile deviation of a symbolic distribution:
Quartile deviation for a list of exact numbers:
 Out[1]=

Quartile deviation of a symbolic distribution:
 Out[1]=
 Scope   (4)
QuartileDeviation works with any real numeric quantities:
Quartile deviations for columns of a matrix:
Obtain results at any precision:
Compute results for a large vector or matrix:
Compute results for a SparseArray:
 Applications   (1)
Obtain a robust estimate of dispersion when extreme values are present:
Measures based on the Mean are heavily influenced by extreme values:
QuartileDeviation is half the difference of linearly interpolated Quantile values:
QuartileDeviation is half the difference between the first and third quartiles:
QuartileDeviation requires numeric values: