Looking at the purchase orders dataset below, which of these…

Looking at the purchase orders dataset below, which of these levels of measurement is NOT represented in any of the columns: Supplier Order No Item No. Item Description Item Cost Quantity Cost per order Order Date Arrival Date Spacetime Technologies A0111 6489 O-Ring $3.00 900 $2,700.00 10/10/2011 10/18/2011 Steelpin Inc. A0115 5319 Shielded Cable/ft. $1.10 17,500 $19,250.00 8/20/2011 8/31/2011 Steelpin Inc. A0123 4312 Bolt-nut package $3.75 4,250 $15,937.50 8/25/2011 9/1/2011 Steelpin Inc. A0204 5319 Shielded Cable/ft. $1.10 16,500 $18,150.00 9/15/2011 10/5/2011 Steelpin Inc. A0205 5677 Side Panel $195.00 120 $23,400.00 11/2/2011 11/13/2011 Steelpin Inc. A0207 4312 Bolt-nut package $3.75 4,200 $15,750.00 9/1/2011 9/10/2011 Alum Sheeting A0223 4224 Bolt-nut package $3.95 4,500 $17,775.00 10/15/2011 10/20/2011 Alum Sheeting A0433 5417 Control Panel $255.00 500 $127,500.00 10/20/2011 10/27/2011 Alum Sheeting A0443 1243 Airframe fasteners $4.25 10,000 $42,500.00 8/8/2011 8/14/2011 Alum Sheeting A0446 5417 Control Panel $255.00 406 $103,530.00 9/1/2011 9/10/2011 Spacetime Technologies A0533 9752 Gasket $4.05 1,500 $6,075.00 9/20/2011 9/25/2011 Spacetime Technologies A0555 6489 O-Ring $3.00 1,100 $3,300.00 10/5/2011 10/10/2011