| Table: Invoice Experiment Error |
| Customer Size | Customer Location | Product Type | Number of Errors |
| - | - | - |
| + | - | - |
| - | + | - |
| + | + | - |
| - | - | + |
| + | - | + |
| - | + | + |
| + | + | + |
| Customer Size: Small (-), Large (+) |
| Customer Location: Foreign (-), Domestic (+) |
| Product Type: Commodity (-), Specialty (+) |
| Customer Size effect | average errors (large) | average errors (small) |
| Customer Location effect | average errors (Foreign) | average errors (domestic) |
| Product Type | average error (Commodity) | average error (specialty) |
| Interactions |
| Size x Location | + | Size x Product | + | Product x Location | + |
| | - | | - | | + |
| | - | | + | | - |
| | + | | - | | - |
| | + | | - | | - |
| | - | | + | | - |
| | - | | - | | + |
| | + | | + | | + |
| Effect | | Effect | | Effect |