Behavioral and Brain Sciences

Short Communication

Throwing the baby out with the bathwater: Problems in modeling aggregated eye-movement data

Gary Feng a1
a1 Department of Psychology: Social and Health Sciences, Duke University, Durham, NC 27708


Parameters in E-Z Reader models are estimated on the basis of a simple data set consisting of 30 means. Because of heavy aggregation, the data have a severe problem of multicolinearity and are unable to adequately constrain parameter values. This could give the model more power than the empirical data warrant. Future models should exploit the richness of eye movement data and avoid excessive aggregation.