More details about the compare package

The "comparison" class The value returned by compare() is an object of class "comparison". Importantly, this is not simply a logical value. In order to test whether the comparison was successful overall, for example as the condition in an if statement, you must use the isTRUE() function. > isTRUE(compare(1:10, 1:10)) [1] TRUE > The transforms() function can be used to extract the vector of transformations from a "comparison" object. > obj1 obj1 [1] "a" "a" "b" "c" > > obj2 obj2 [1] a a b c Levels: a b c > > transforms(compare(obj1, obj2[1:3], allowAll=TRUE)) [1] "coerced from to " [2] "shortened model" >