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Conditional probabilities and the grid test for schizophrenic thought disorder
Author(s) -
Allon Richard,
Stewart M. F.,
Lancee W. J.,
Brawley Peter
Publication year - 1981
Publication title -
british journal of clinical psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.479
H-Index - 92
eISSN - 2044-8260
pISSN - 0144-6657
DOI - 10.1111/j.2044-8260.1981.tb00496.x
Subject(s) - psychology , schizophrenia (object oriented programming) , test (biology) , population , thought disorder , grid , statistics , conditional probability , sample (material) , psychiatry , psychosis , demography , mathematics , paleontology , geometry , sociology , biology , chemistry , chromatography
The grid test for schizophrenic thought disorder was administered to a sample of 149 psychiatric patients. This sample was drawn from a population with a known base rate of schizophrenia and an estimated base rate of thought disorder, thus allowing for the calculation of population specific cutting scores for the grid test. The grid test, using these data along with others from previous grid test studies, was then analysed for diagnostic efficiency using conditional probability formulae. The conclusion reached is that the grid test for schizophrenic thought disorder is unsatisfactory as a diagnostic instrument.