The essentials of mental measurement / by William Brown.

  • Brown, William, 1811-
Date:
1911
Catalogue details

Licence: In copyright

Credit: The essentials of mental measurement / by William Brown. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    others), amounting to over 100, but the much smaller numbers recorded as Groups Ya and Yb were alone used for the evalua- tion of coefficients, since they alone displayed sufficient reha- bility and homogeneity for the purpose. (1) ER Test. Pages of French words, arranged in irregular order so that they did not make sense, and so chosen that the number of e's and r's was approximately constant from line to line, were employed. The page was given out face downwards, and at a given signal the subject turned it over and proceeded to cross through every e and every r that he came to, beginning with the first line and moving down line by line, until he received the signal to stop. The time allowed for the test was 5 minutes in the case of the children and 3 minutes in the case of the adults. The subject was urged to avoid passing over any of the stated letters but otherwise to work as quickly as possible. Before the commencement of the test, a full explanation of it was given to the group, illustrated by examples on the black- board. This was done in the case of every test. A different set of words was employed in the second test. System of marking : 1 mark for every letter crossed through correctly ; —1 mark for every letter passed over or crossed through incorrectly. Results of ER Test Group Mean (T Coefficient of Variation Eeliability coefficient ('•,) for each test Eel. coeif. (r„) for amalgamated pair 2?-, t of tests, ?-o = :;—— I 377 + 6 68 + 4 18 + 1-1 -60 •75 II 362 + 8 71 + 5 19-5 + 1-5 -65 •79 III 417 + 6 57 + 4 13-7 + 1-] •75 •86 *V(a) 204 + 4-5 41 + 3-3 20+1-7 -97 - * One test only. t r2 measures the extent to which the amalgamated results of the two testa