Abstract
This note considers critically the indices and tests of significance used to assess and interpret social mobility in the symposium Social Mobility in Britain, edited by D. V. Glass (1954), London. Numerical examples are given to show that the indices may yield unrealistic and contradictory answers and that the tests of significance are used to test a hypothesis for which they are not suited. It is thus difficult to rely upon the examples and also the indices unless some simple intuitive or common sense check is available. An appendix by J. Durbin deals with one possible means of overcoming the statistical problems raised.

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