Table 7.
Fixed K Results for Functional Connectivity Matrices
| Functional connectivity matrix | Ward’s K | SSE Ward’s – SSE K-means | % Difference | ARI |
|---|---|---|---|---|
|
| ||||
| Schaefer100_17_sub-001_gng_inhibition | 4 | 0.00059521 | 12.09% | 0.6914 |
| Schaefer100_17_sub-001_gng_initiation | 3 | 0.00074619 | 1.63% | 0.7227 |
| Schaefer100_17_sub-001_nbk_0back | 2 | 0.00079000 | 1.15% | 0.9600 |
| Schaefer100_17_sub-001_nbk_1back | 2 | 0.00013324 | 0.65% | 0.8824 |
| Schaefer100_17_sub-001_nbk_2back | 4 | 0.00234554 | 11.08% | 0.7707 |
| Schaefer100_17_sub-001_tsw_shifting | 2 | 0.00776123 | 21.04% | 0.3073 |
| Schaefer200_17_sub-001_gng_inhibition | 2 | 0.00093945 | 5.95% | 0.5893 |
| Schaefer200_17_sub-001_gng_initiation | 4 | 0.00066151 | 5.08% | 0.8113 |
| Schaefer200_17_sub-001_nbk_0back | 2 | 0.00079530 | 2.98% | 0.7383 |
| Schaefer200_17_sub-001_nbk_1back | 2 | 0.00069729 | 4.81% | 0.8091 |
| Schaefer200_17_sub-001_nbk_2back | 4 | 0.00024676 | 3.07% | 0.5033 |
| Schaefer200_17_sub-001_tsw_shifting | 4 | 0.00078530 | 12.27% | 0.6829 |
| Power229_10_sub-001_gng_inhibition | 3 | 0.00038341 | 2.91% | 0.8035 |
| Power229_10_sub-001_gng_initiation | 3 | 0.00044213 | 6.91% | 0.4589 |
| Power229_10_sub-001_nbk_0back | 5 | 0.00093608 | 9.87% | 0.5387 |
| Power229_10_sub-001_nbk_1back | 3 | 0.00046089 | 5.49% | 0.7103 |
| Power229_10_sub-001_nbk_2back | 3 | 0.00102876 | 13.33% | 0.6757 |
| Power229_10_sub-001_tsw_shifting | 2 | 0.00448353 | 13.16% | 0.5428 |
| Schaefer100_17_sub-002_gng_inhibition | 3 | 0.02409128 | 13.49% | 0.6673 |
| Schaefer100_17_sub-002_gng_initiation | 3 | 0.00280519 | 4.55% | 0.6507 |
| Schaefer100_17_sub-002_nbk_0back | 3 | 0.04710088 | 36.37% | 0.3495 |
| Schaefer100_17_sub-002_nbk_1back | 2 | 0.00786211 | 8.69% | 0.8448 |
| Schaefer100_17_sub-002_nbk_2back | 4 | 0.00391188 | 12.67% | 0.7464 |
| Schaefer100_17_sub-002_tsw_shifting | 3 | 0.00090796 | 5.75% | 0.9053 |
| Schaefer200_17_sub-002_gng_inhibition | 5 | 0.00621493 | 21.37% | 0.5474 |
| Schaefer200_17_sub-002_gng_initiation | 5 | 0.00092222 | 9.90% | 0.7047 |
| Schaefer200_17_sub-002_nbk_0back | 4 | 0.00161890 | 9.65% | 0.7545 |
| Schaefer200_17_sub-002_nbk_1back | 2 | 0.00038721 | 1.62% | 0.9212 |
| Schaefer200_17_sub-002_nbk_2back | 3 | 0.00071167 | 4.66% | 0.8182 |
| Schaefer200_17_sub-002_tsw_shifting | 4 | 0.00078530 | 12.27% | 0.6829 |
| Power229_10_sub-002_gng_inhibition | 3 | 0.00336363 | 17.70% | 0.5747 |
| Power229_10_sub-002_gng_initiation | 4 | 0.00028062 | 5.75% | 0.6859 |
| Power229_10_sub-002_nbk_0back | 3 | 0.00051160 | 6.46% | 0.7372 |
| Power229_10_sub-002_nbk_1back | 3 | 0.00034313 | 4.36% | 0.7418 |
| Power229_10_sub-002_nbk_2back | 3 | 0.00054237 | 8.78% | 0.5242 |
| Power229_10_sub-002_tsw_shifting | 2 | 0.00029968 | 1.52% | 0.8965 |
Note. The values in column K are the number of communities selected when using the walktrap algorithm with Ward’s method. For the given number of communities, the next column reports the amount (after multiplication by 104 to improve readability) by which the SSE using Ward’s method exceeds the SSE using multistart K-means. The percentage difference in the SSE values (Ward minus K-means)/K-means is also provided. The adjusted Rand index (ARI) measure of agreement between the Ward’s method and K-means partitions is reported in the last column.