This function checks whether an intercept is present in a formula of
some form. It works for a
pim.formula object or
a character vector representing a formula.
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In case of a
terms.object, this function only checks whether the
intercept attribute is larger than 0. In all other cases, the
function checks whether it can find a
+ 1 somewhere in the formula,
indicating that an intercept has to be fit in a
a single logical value
This function is meant to be used in the context of a
call. Although the function should work for standard formulas as well,
correct results are not guaranteed when used outside a pim context.