| Parameter | Definition | Relation |
| Bj | Bid amount |
|
| M | Number of Bid amounts |
|
| Nj | Number of no responses (WTP = 0) to bid Bj |
|
| Yj | Number of yes responses (WTP = 1) to bid Bj |
|
| Tj | Total number of offered bid Bj | Tj = Nj + Yj |
| Fj | Pr (WTP ≤ 0) | Fj = Nj/Tj |