Table 7.
Comparison of eye-movement measures computed with algorithms that use the POR of both eyes, respectively only the left eye
| Measure | Statistic | Overall | Reading | Search | Ad exploration |
|---|---|---|---|---|---|
| Number of fixations | Mean difference | 13.65 | 33.37 | 3.00 | 3.47 |
| MAD | 13.79 | 33.37 | 3.19 | 3.71 | |
| MAPD | .14 | .17 | .13 | .12 | |
| Correlation | .99 | .96 | .98 | .98 | |
| Fixation durations (ms) | Mean difference | –44.69 | –57.74 | –46.07 | –32.24 |
| MAD | 47.64 | 57.75 | 52.53 | 35.40 | |
| MAPD | .19 | .21 | .22 | .16 | |
| Correlation | .79 | .92 | .61 | .78 | |
| Saccade size (°) | Mean difference | –.46 | –.34 | –.47 | –.56 |
| MAD | .51 | .34 | .52 | .65 | |
| MAPD | .16 | .19 | .16 | .14 | |
| Correlation | .97 | .93 | .95 | .89 |
Note: The reported statistics are: mean difference: the overall mean for the eye-movement measure in question, computed using individual specific velocity thresholds based on both eyes minus the overall mean computed using individual specific velocity threshold based on only the left eye; MAD Mean absolute deviation of the measures computed using velocity thresholds based on both eyes and only the left eye; MAPD Mean absolute percentage deviation of the measures computed using velocity thresholds based on both eyes and only the left eye; Correlation Correlation coefficient of the measures computed velocity thresholds based on both eyes and only the left eye