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| Levels | Prior distributions |
|---|---|
| level 1 (high) | Beta(0, 0) |
| level 2 ( average) | [Beta(0, 0) + Beta(1/2, 1/2)]/2 |
| level 3 (medium) | Beta(1/2, 1/2) |
| level 4 (low) | [Beta(1/2, 1/2) + Beta(1, 1)]/2 |
| level 5 (unknown) | Beta(1, 1) |
