Table 4.
Explained variation of POR during fixation across individuals, eyes (left vs. right) and tasks
| Predictor | Predictor | ||
|---|---|---|---|
| Individuals | Tasks | Eye (left vs. right) | |
| Mean x | .21 | .04 | .03 |
| Mean y | .16 | –.06 | –.02 |
| sd(x) | .83 | .05 | –.00 |
| sd(y) | .77 | .08 | –.00 |
| r(xl, yl) | .26 | .06 | – |
| r(xr, yr) | .29 | .01 | – |
| r(xl, xr) | .57 | –.00 | – |
| r(yl, yr) | .61 | .01 | – |
| r(xl, yr) | .39 | –.01 | – |
| r(yl, xr) | .25 | –.01 | – |
Note: Reported values are median posterior estimates of the explained variance in the linear mixed effects model in WINBUGS using the procedure of Gelman and Pardoe (2006). Similar to the adjusted R2, it is possible for this procedure to produce negative values if the explained variance of a parameter is so poor that it is larger than the variance of the data (see Gelman and Pardoe (2006), p.244)