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7.3  Assessing an internal model
7.3.1  Error
 The error is measured using a distance metric  between subspaces of PS. The error of an expression, l, being given by
 between subspaces of PS. The error of an expression, l, being given by  . This must obey the usual stipulations for a distance metric:
. This must obey the usual stipulations for a distance metric:  ,
,  and
 and  . Examples include RMSE or maximum cartesian distance.
. Examples include RMSE or maximum cartesian distance.
Modelling Learning as Modelling - 23 FEB 98
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