Behavior Research Methods, Instruments & Computers, 1998, 30(4), 583-591.

This paper considers the different methods that have been developed to quantify random generation behavior, and incorporates these measurement scales into a Windows 95 computer program called RgCalc. RgCalc analyzes the quality of human attempts at random generation, and can provide computer-generated, pseudo-random sequences for comparison. The different algorithms for the evaluation of a dataset are detailed, and an outline of the program is described. Performance measures are available for assessing various aspects of the response distribution, the sequencing of pairs, the ordinal relationships between sets of items, and the tendency to repeat alternatives over different lengths. The program is designed to be appropriate for the analysis of most types of random generation situation employed in the psychological literature, and a factor analysis is used to illustrate the multiple dimensions underlying human randomization processes.