Exercise

Bad transformFunc functions

Why is the following function inappropriate to use as a transformFunc function? Assume all elements of mylist on the right side of the assignment exist.

myFun <- function(mylist){

mylist$newvar <- scale(mylist$oldvar)

mylist$newvar2 <- mylist$oldvar2 - myOtherVar

}

Instructions

50 XP

Possible Answers

A) It creates multiple new elements/variables in mylist.
B) It uses the scale() function, which only considers the data that are currently read into memory.
C) It accesses an object (myOtherVar) that is not defined in the scope of the function.
D) It uses the “$” to gain access to individual variables in mylist.
E) All of the above cause problems.

Take Hint (-15 XP)