There are inconsistencies in Spatt's paper. Also, there are discrepancies between Spatt's results and those of the present author.
References
1.
GinsburgN.KarpiukP. (1995) Simulation of human performance on a random generation task. Perceptual and Motor Skills, 81, 1183–1186.
2.
SpattJ. (1996) Evaluation of a simulation of human performance on random-digit generation: Measures of concept and redundancy. Perceptual and Motor Skills, 83, 319–322.