range - Range of values
Syntax
range(X)
y = range(X,dim)
Description
range(X) returns the difference
between the maximum and the minimum of a sample. For vectors, range(x) is
the range of the elements. For matrices, range(X) is
a row vector containing the range of each column of X. For N-dimensional
arrays, range operates along the first nonsingleton
dimension of X.
y = range(X,dim) operates along the dimension dim of X.
range treats NaNs as missing
values and ignores them.
The range is an easily-calculated estimate of the spread of
a sample. Outliers have an undue influence on this statistic, which
makes it an unreliable estimator.
Examples
The range of a large sample of standard normal random numbers
is approximately six. This is the motivation for the process capability
indices Cp and Cpk in
statistical quality control applications.
rv = normrnd(0,1,1000,5);
near6 = range(rv)
near6 =
6.1451 6.4986 6.2909 5.8894 7.0002
See Also
std, iqr, mad
 | randtool | | ranksum |  |
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