Figure 2

Figure 2. Sample rules from a rough set analysis

For Total Daily Sales Amount (TDSA) outcome:

1.     if weather = sunny and day = Saturday and
       location = swimming pool
       then TDSA is between $65 and $72

or

2.     if weather = cloudy and price = 20 cents and
       type sold = regular
       then TDSA is between $21 and $25

For Sale Per Customer (SPC) outcome:

1.    if customer's age = 11-15 and
      zip code extension = this neighborhood and
      promotion = 10 cents
      then SPC > 40 cents

or

2.    if customer age = 6-10 and
      location = playground and
      promotion = licorice gift
      then SPC > 40 cents