attributes the covariate with respect to the name, direction, anchor point, and class.
iso(z, shape)The value \(z\) with attribution of its name, shape and median anchor point.
a univariate covariate.
a direction of \(z\) (\(shape\)="increasing" or "decreasing").
Yunro Chung [cre]
Internal function. The iso function attributes the covariate \(z\) for its name, shape , anchor point and class, where the anchor point is set to a median of \(z\)'s, and class is set to "iso covariate"