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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    Results of Motor Test. Group Mean <r Coefficient of Variation Reliability coefficient xveiiauiiity coefficient I 718 + 13 148 + 9 20-6+1-3 •91 -95 II 720+16 148 + 12 20-5 + 1-7 -85 -92 III 813+11 103 + 7-7 12-7 + 1-0 -76 -86 (4) Addition Test Duplicates of pages from one of Kraepelin's Rechenhefte were used, adapted to the purpose by the printing of short horizontal lines below each tenth figure, and by the omission of all figures below the thirtieth in each column. Time allowed for each test—five minutes. The speed of addition [4 (a)] was measured by the number of sums (groups of ten digits) worked in the given time, the accuracy of addition [4 (b)] by the per- centage of correct answers. In the case of the children, 4 (a) was measured by the number of digits added, marks being allowed for the part of a sum with which they usually ended. Results of Addition Test. Group Mean Speed Accuracy Speed Accuracy I II III *IV *V(a) V(i) 235 + 6 210±6 287 ± 9 55 + 1-5 61 + 21 163 + 3 149 + 4 171 + 1-4 173 + 1-5 184 + 1-2 67±4 52 + 4 79 + 6 16+1-0 19 + 1-5 31-3 + 1-8 33-4 + 2-5 13-3 + 1 16-8 + 1-1 11-3 +-9 • One sura of 10 digits taken as unit; in other cases, the number of digits added was taken as the measure.