Abstract

Notes that various methodological problems have occurred in some recent free-response experiments in parapsychology. Statistical errors have involved improper assumptions of independence, multiple analysis of data and, to a lesser extent, data selection and misapplication of the normal approximation to the binomial. The inability to accurately measure information in free-response judging procedures has led to a general lack of statistical sensitivity and to incorrect inferences about ESP "information rates." Further, the possibility of sensory cues has not been completely eliminated in several experiments. Most of these problems can easily be avoided with slight alterations in experimental design. (33 ref)