Table 5. Single- and multi-compartment model fits to experimental data.
In this table, we show the R-squared values (goodness-of-fit) for the model fits to the nine-stimulus conditions. Both the fits using the single- and multi-compartment models are shown. These R-squared values have been adjusted for the degrees-of-freedom in each model. For each condition, we calculated the partial R-squared value for the flow, volume and oxy-/deoxy-hemoglobin measurements (Devore 1995). This value indicates the explained model variance considering only that component of the measurements. The total R-squared indicates the fraction of the total variance accounted for by all measurements. The multi-compartment model significantly improved the fits to the data (p<8×10-5) [Z-transform/T-test; described in text]. The most notable improvements were observed in the modeling of deoxy-hemoglobin (p<8×10-6).
| Stimulus Condition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
| Multi-compartment | |||||||||
| R2adj - HbO2 | 0.94 | 0.98 | 0.97 | 0.90 | 0.99 | 0.98 | 0.98 | 0.99 | 0.99 |
| HbR | 0.81 | 0.98 | 0.98 | 0.95 | 0.96 | 0.98 | 0.97 | 0.99 | 0.98 |
| HbT | 0.94 | 0.96 | 0.93 | 0.87 | 0.99 | 0.97 | 0.98 | 0.99 | 0.99 |
| CBF | 0.92 | 0.73 | 0.86 | 0.92 | 0.99 | 0.96 | 0.98 | 0.92 | 0.97 |
|
| |||||||||
| Total | 0.91 | 0.95 | 0.95 | 0.89 | 0.98 | 0.98 | 0.98 | 0.98 | 0.99 |
|
| |||||||||
| Single-compartment | |||||||||
| R2adj - HbO2 | 0.94 | 0.96 | 0.93 | 0.85 | 0.98 | 0.97 | 0.95 | 0.98 | 0.98 |
| HbR | 0.62 | 0.81 | 0.66 | 0.68 | 0.81 | 0.79 | 0.76 | 0.81 | 0.74 |
| HbT | 0.94 | 0.95 | 0.90 | 0.87 | 0.98 | 0.95 | 0.97 | 0.98 | 0.98 |
| CBF | 0.93 | 0.63 | 0.85 | 0.92 | 0.97 | 0.93 | 0.98 | 0.88 | 0.95 |
|
| |||||||||
| Total | 0.89 | 0.88 | 0.87 | 0.87 | 0.95 | 0.93 | 0.94 | 0.95 | 0.95 |