"Groupitizing": a strategy for numerosity estimation

Each file contains a matrix called “matr”. Each row of the matrix “matr” is a trial. The columns contain the following information: subject response the presented numerosity subject response zeros stimulus duration Response time Grouped (1) or random (2) presentation 1 1 Number of items of the upper-left quadrant Number of items of the lower-left quadrant Number of items of the upper-right quadrant Number of items of the lower - right quadrant