Mental aspects of delinquency / by Truman Lee Kelley.

  • Kelley, Truman Lee, 1884-1961.
Date:
[1917]
Catalogue details

Licence: Public Domain Mark

Credit: Mental aspects of delinquency / by Truman Lee Kelley. Source: Wellcome Collection.

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    The large number of omissions in the record for this test are due to a number of causes, entirely chance so far as their rela- tion to the capacity of subjects is concerned. Photographs of the structures were taken, and the grading was done from the photographs. In keeping track of the structures, a small slate with a designating number was placed so as to be included in the photograph. Due to poor light conditions, reflections from the slate, and improper development, many of these numbers could not be deciphered, thus accounting for the omission of a number of merit gradings. Completion Test: Developmental age equivalents for com- pletion tests scores are given, except. when it is better than the © median adult score, in which case, of course, mental age can- not be given. It is then only possible to say that the individual lies in a certain percentile of the adult group. This, aecord- ingly, has been done, so that a score in the record below 18 indicates mental age, while one above 50 indicates the percentile of adult standing. No scores between 18 and 50 will be found. In order to average these percentile scores, it has been neces- sary to give some mental age to them. The age 20 has been assigned. . Developmental Age: The developmental age grade for each | individual is an average estimate of mentality based upon the three mental tests, Binet, constructive ability and completion, after each has been expressed in terms of mental age. It is thus’ entirely a derived measure, but is considered more reliable than any one alone of the three measures upon which it is based. These three tests tap the capacity of the individual in many ways and this final score, designated D. A., developmental age, is the one upon which the final conclusions as to retardation are based.