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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: J Exp Psychol Learn Mem Cogn. 2018 Jul 19;44(11):1687–1713. doi: 10.1037/xlm0000547

Table 2.

The descriptive statistics of eye-movement measures for each Analysis differing in the unit of anlysis, and the predictors used in each Analysis.

Unit of analysis Dependent Variables N Min Max Mean SD Predictors
Analysis 1 Word Skipping 16295 0 1 0.21 0.41 All text- and participant-level predictors (19 total)
Fixation position, pixels 12762 0 195.9 48.63 32.84
First fixation duration, ms 12762 51 991 221 98
Gaze duration, ms 12762 51 1782 263 155
First-pass regression 12762 0 1 0.16 0.36
Regression path duration 12762 51 29407 583 1168
Total reading time, ms 12762 51 2913 399 285
Analysis 2 Word (sentence final words only) Skipping 1876 0 1 0.26 0.44 All text-level predictors except forward transitional probability, and all participant-level predictors (18 total)
Fixation position 1388 0 230.5 55.88 39.42
First fixation duration 1388 6 1114.0 212.34 106
Gaze duration 1388 15 1959.0 262.08 168
First-pass regression 1388 0 1 0.25 0.43
Regression path duration 1388 24 31479 963 2248
Total reading time 1388 15 2804 419 327
Analysis 3 Passage Total number of skips (per word) 243 0.14 0.60 0.33 0.09 GORT Complexity index and all participant-level variables (13 total)
Total number of fixations (per word) 243 0.50 2.02 1.16 0.30
Total number of regressions (per word) 243 0.01 0.33 0.15 0.05
Total reading duration (per word) 243 103.00 511.63 251.90 74.31
Comprehension score (per passage) 243 0.00 5.00 3.54 1.29