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Decline in scoring rate within tests of PK
Quarter distribution of hits on the record page and set
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applied average chance expectation Chapter clairvoyance tests conclusive critical ratio dice distance dowser dowsing Duke effect ESP record ESP scoring ESP tests evaluation evidence exploratory exploratory tests Extrasensory Perception fact factors field GESP given hits Humphrey hypothesis important indicate individual influence involved J. B. Rhine key cards matching mediumship ment mental menter nature negative deviation nonphysical objective obtained occurrence operation parapsychical Parapsychol Parapsychology Laboratory person physical PK tests possible practice Pratt precautions precognition present probability problem psi capacity psi experiences psi function psi phenomena psi test psi-missing Psychical Res Psychical Research psychokinesis psychological question random record sheets relation research worker Rhine scientific score total scoring rate screen second experimenter sensory shuffling significant spontaneous stage standard deviation statistical methods success symbols target face technique telepathy tion total score two-experimenter types of psi