Blurb:: Normalize by sample mean of function values

Description::

For each reponse function \f$f_i\f$, normalize its gradient data by
the mean \f$m_i\f$ of the function values taken across samples \f$
j=1,...,J \f$:

\f[ m_i = \frac{1}{J} \sum_{j=1}^{J}{f_i^j} \f]


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