This operator allows you to add objects to a psdesign object, such as integration models and risk models
# S3 method for ps
+(p1, p2)An object of class psdesign
Another object to be added to p1, see list below for possible options
If the first object is an object of class psdesign, you can add
the following types of objects, and it will return a modified psdesign
object. Users will generally add them in the order that they appear.
integration: Add or replace integration model
riskmodel: Add or replace risk model
estimate: Estimate parameters
bootstrap: Bootstrap estimates