Figure 1. The variables in the SDC database.

  • Sale ID # (generated by the database)
  • Date
  • Time of Day
  • Day of Week
  • Location
  • Type sold (pink or regular)
  • Price per unit
  • Units sold per customer
  • Sale amount
  • Total daily sales amount
  • Salesperson
  • Stand type (one is painted yellow; the other red)
  • Temperature
  • Weather condition (sunny, cloudy, foggy, drizzle, rain)
  • Customer transportation type (foot, bike, car, rollerblades, misc.)
  • Customer age range (1 - 5; 6 - 10; 11 - 15; 16 - 20; 21 - 30; 31 - 40; over 40)
  • Customer zip code (yes, they were cheeky enough to ask)
  • Customer zip code extension
  • Customer return flag (y or n)
  • Advance signs flag (y or n - signs on roadway in advance of stand)
  • Promotion Type (none, 10 cents off, free cup, licorice gift)
  • Coupon flyer type (None, rich, comfortable, or broke - the kids put coupons in mailboxes according to their perception of the homeownees wealth)