% Common definitions for premium calculation
\sectiondept{it}

\sigauth{MTG}
A \dfn{premium calculation}---or simply \dfn{calculation}---is an algorithm that
\index{deterministic}deterministically operates on ^[input data] described in
\sref{indata} and yields a numeric \dfn{premium}.

\sigauth{MTG}
\p{finalprem}
A \dfn{premium!final premium} is the ^[premium] that represents the total cost
to the insured and \shall be represented by a ^[floating-point] number rounded
to the nearest representable value of two decimal places, in which the whole
integer value \shall represent a dollar amount and the fractional value \shall
represent cents. There \shall be only one final premium.\footnote{Multiple
^[final premium]s may be obtained through multiple calls to the~^[rater].}

\sigauth{MTG}
A calculation \dfn{calculation!consideration} is defined as the point when an
implementation determines if the calculation is applicable to the ^[input data].

\sigauth{MTG}
\p{calc-supp}
All defined rating calculations \shall be considered even if they exist outside
of any dependency tree that arrives at the ^[premium!final premium].
Calculations that are not directly used to determine the ^[premium!final
premium] are termed \dfn{calculation!disjoint calculations}.\footnote{This
allows supplementary data to be calculated.}

\sigauth{MTG}
\p{calcapplicable} A calculation \shall be
\index{calculation!consideration}considered to be applicable if its defined
^[classification] conditions are met.

\sigauth{MTG}
An applicable calculation \shall undergo \dfn{calculation!evaluation}, yielding
a~premium that is the result of the application of the ^[input data] to its
definition.

\sigauth{MTG}
A calculation that has been determined to be inapplicable \shallnot execute any
portion of its definition and \shall yield the scalar floating-point
value~$0.00$.\footnote{The definition \shallnot be executed because it cannot
reliably do so without the proper data (as determined by its required
classifications).}

\sigauth{MTG}
A calculation \may treat the result of another calculation as ^[input data].

\sigauth{MTG}
A calculation \may treat the result of a~^[classification] (see
\sref{dataclass}) as ^[input data].

\sigauth{MTG}
Where it is required that a calculation be performed for each ^[location], the
implementation \shall make such a determination either by (a)~use of a
^[parameter] defined in \sref{locparam} that is always available or (b)~an
implementation-defined ^[parameter] that explicitly provides the location count.
For either case, an implementation \must fail in error if the location count
cannot be determined.

\sigauth{MTG}
In the sections that follow, the following conventions \shall hold: (a)~Any
reference to a table value, unless otherwise stated, \shall be located by
matching the ^[parameter]s in the table column headers with the value of the
associated argument in any input data; (b)~any ^[parameter] containing the
term~``rate'' represents a~value obtained in an implementation-defined manner
and an implementation \must fail in error if such a value cannot be obtained as
mandated by the calculation definition.