An introduction to the theory of mental and social measurements / by Edward L. Thorndike.
- Edward Thorndike
- Date:
- 1904
Licence: In copyright
Credit: An introduction to the theory of mental and social measurements / by Edward L. Thorndike. Source: Wellcome Collection.
90/232 page 74
![the mode may be used to prophesy what position it would probably take with a very great number of cases. Commonly with 200 or more measurements and with a grouping into not over 18 divisions, the mode is clear enough.* The series of measures of Table XXVIII. may be taken as an example. 26 to 30 is the choice for a broad mode and 28 to 30 the best choice for a narrow one. TABLE XXVIII. Money Available for School Purposes Divided by Average Attendance ; THAT IS, Cost per Pupil for Full Year’s Actual Attendance, Cities OF U. S. Keport of Com. OF Ed,, 1901. Quantity. Dollars. Frequency. Frequency in wider grouping. Quantity. Dollars. Frequency. Frequency in wider grouping, 10-11.99 6 11 4 5 9 12- 5 6 4 14 10 24 8 6 9 6 14 60 3 8 20 36 2 2 6 20 16 4 4 2 31 60 6 5 9 4 29 8 4 6 34 73 70 2 2 8 39 2 0 30 31 61 . 4 2 2 2 30 6 0 4 24 42 8 2 3 6 18 80 1 8 17 39 2 2 2 40 22 4 0 2 16 32 6 0 0 4 16 8 0 6 15 29 90 1 2 8 14 V. 2 1 50 3 13 4 0 1 2 10 6 1 465 Determination of the Median. — The median is the [ (ii + l)/2]“ measure. Count in from each end, putting down occasionally the sums from the beginning. As the median is approached put them all * These rough and ready methods of estimating the probably most frequent measure serve for any studies likely to be made by the non-mathematical student. A convenient account of a more precise method will be found in the Jouimal of the Royal Statistical Society for 1896, pp. 343-346.](https://iiif.wellcomecollection.org/image/b28082370_0090.jp2/full/800%2C/0/default.jpg)
