Data were collected on 1,053 men admitted to Grendon during the period 1984-1994 on age, number of previous convictions, the Ravens Progressive Matrices, the Hostility and Direction of Hostility Questionnaire, and the Eysenck Personality Questionnaire. A correlation matrix between the assessment variables and time at Grendon was produced and subjected to principal component analysis. Four typologies of Grendon inmates were identified: Component 1 is described as younger, extrapunitively hostile, tough minded, and neurotic, and it had a negative correlation with length of stay. Component 2 is described as intropunitively hostile, neurotic, and introverted; and Component 3 is described as bright, emotionally stable, and truthful. Components 2 and 3 were positively correlated with length of stay. Component 4 is described as older, emotionally stable, recidivist, and it had a negative correlation with length of stay. Correlations between all four components and length of stay were of a low order of magnitude but highly statistically significant.
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