correl
======

correlation of two variables



Calling Sequence
~~~~~~~~~~~~~~~~


::

    rho=correl(x,y,fre)




Arguments
~~~~~~~~~

:x real or complex vector
: :y real or complex vector
: :fre matrix of type length(x) x length(y)
:



Description
~~~~~~~~~~~

`correl(x,y,fre)` computes the correlation of two variables x and y.
fre is a matrix of dimensions length(x) x length(y). In fre the
element of indices (i,j) corresponds to the value or number or
frequences of x_i&y_j.



References
~~~~~~~~~~

Wonacott, T.H. & Wonacott, R.J.; Introductory Statistics, J.Wiley &
Sons, 1990.



Examples
~~~~~~~~


::

    x=[2.5 7.5 12.5 17.5]
    h=[0 1 2]
    fre=[.03 .12 .07;.02 .13 .11;.01 .13 .14;.01 .09 .14]
    rho=correl(x,h,fre)




See Also
~~~~~~~~


+ `covar`_ covariance of two variables


.. _covar: covar.html