Table 1. Site-models used in to analyze Pacific salmonid mitochondrial gene sequences, the numbers of parameters estimated for each model (p), and all of the parameters included in each model.
| Model | p | Parameters |
| M0 (one ratio) | 1 |
|
| M1a (neutral) | 2 |
p
0 (p
1 = 1−p
0)  <1,  = 1 |
| M2a (selection) | 4 |
p
0, p
1 (p
2 = 1−p
0−p
1)  <1,  = 1,  >1 |
| M3 (discrete) | 5 |
p
0, p
1 (p
2 = 1−p
0−p
1)  ,  , 
|
| M7 (beta) | 2 | p, q |
M8 (beta &  ) |
4 |
p
0 (p
1 = 1−p
0),  >1; p, q
|
Descriptions of each model are given in the Methods section.