When I was doing Econometrics at Uni, the lecturer wouldn't let us use the functions in the software that did the mathematics for us. He made us learn using Spr

When I was doing Econometrics at Uni, the lecturer wouldn't let us use the functions in the software that did the mathematics for us. He made us learn using Spreadsheets and doing the calculations manually, _then_ he let us use the automated functionality once we understood it.