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Number of parameters accounted for in the calculation of Akaike’s information criterion
| Model | Fixed parameters | Time-varying parameters | K |
|---|---|---|---|
| LinFix | 1 | 1 | N + 2 |
| LinFree | 0 | 2 | 2N + 1 |
| Langew | 1 | 2 | 2N + 2 |
| Sigm | 0 | 4 | 4N + 1 |
| Shroff | 1 | 1 | N + 2 |
| Burkh | 8 | 0 | 8 |
N = number of samples per cardiac cycle. K = number of parameters used for AIC calculation
