By the end of this chapter you will be able to:

• Create macros
• Use macros

Creating macros

• Create a macro:
  • Press in the left-hand menu bar to bring up the list of macros
  • Press  in the list of macros to create a new macro
  • Configure the macro:
    • Name: NumOfWeeks
    • Minimum Parameters: 2
    • Maximum Parameters: 2
    • Expression: create an expression to work out the number of weeks - as a whole number – between two dates
      • Use the functions dateDiff() and round() to help with this
  • Press  to save your new macro

Using Macros

• Create a new model: Try Macros
• Drag the Stream MC Macro Terminated Customers on to your model

This contains some key dates for terminated customers: the signup date; the date that the customer terminated their service; the date that the final debt on the customer's account was cleared

• Add attributes for:
  • the number of weeks between signup and termination
  • the number of weeks between termination and the final debt being cleared
• In each case, use your macro to calculate the number of weeks between the two dates
• Run the stream MC Macro Terminated Customers to test your new attributes