A statistical analysis of timing behavior

(1) When rabbits were trained on a differential reinforcement of low rate (DRL) 10 sec schedule, they successively made bar‐press response so that a sequence of inter‐response time (IRT) intervals were obtained for each training session. This sequence was subjected to the following statistical analysis. (2) The serial correlation coefficients of order 1 to 50 were calculated on each sequence. They were between –0.2 and +0.2, and seemed to be essentially zero. (3) The distribution of IRT intervals was found to be represented by a composite Weibull distribution function. (4) The relation between one of the Weibull parameters, shape parameter, and the hazard function of the bar‐pressing was discussed.