 | Yale University Psychology Laboratory - Psychology - 1899 - 538 pages
...another representative variation. Mean error. Another representative deviation might be found by taking the square root of the average of the squares of the deviations, or \V* . pJ >/ If I ' i ' ' t < " ' ~r M This is known as the " mean error," or "mean -square error,"... | |
 | Edward Lee Thorndike - Education - 1903 - 196 pages
...individual measures lie between Av. — PE and Av.+ PE The standard deviation (a) of a distribution = the square root of the average of the squares of the...deviations of the individual measures from their average. The coefficient of variability = some measure of variability divided by some measure of the general... | |
 | Edward Lee Thorndike - Education - 1903 - 198 pages
...individual measures lie between Av. — PE and Av.+ PE The standard deviation (a) of a distribution = the square root of the average of the squares of the...deviations of the individual measures from their average. The coefficient of variability = some measure of variability divided by some measure of the general... | |
 | Edward Charles Elliott - Education - 1905 - 124 pages
...central tendency of any item of expenditure; or a more accurate measure yet of this group deviation, the square root of the average of the squares of the deviations of the individual measures from their median—the so-called mean square deviation, or standard deviation. As these measures are concerned... | |
 | Edward Lee Thorndike - Variation (Biology) - 1907 - 60 pages
...Average Deviation The most burdensome of the ordinary statistical operations is the calculation of the square root of the average of the squares of the deviations of a series of measures from their central tendency, that is, of the mean square deviation. In the case... | |
 | Naomi Norsworthy - Children with mental disabilities - 1908 - 648 pages
...Average Deviation The most burdensome of the ordinary statistical operations is the calculation of the square root of the average of the squares of the deviations of a series of measures from their central tendency, that is, of the mean square deviation. In the case... | |
 | Edward Lee Thorndike - Educational psychology - 1910 - 274 pages
...signs) of the individual measures from their central tendency. The Mean Square Deviation (SD dis.) = the square root of the average of the squares of the deviations of the individual measures from their central tendency. Measures of Reliability. The average deviation of the true central tendency from... | |
 | Mary Theodora Whitley - Psychophysiology - 1911 - 160 pages
...smallest stroke of virtue or of vice leaves its never so little scar. m 66 The mean square deviation equals the square root of the average of the squares...individual measures from their average, median, or mode. IV The abstract scheme of successive predications, extended indefinitely, with all the possibilities... | |
 | Mary Theodora Whitley - Psychophysiology - 1912 - 694 pages
...sorts: measures of the averaging type and measures of the percentile type. The mean square deviation equals the square root of the average of the squares...individual measures from their average, median, or mode. IV The abstract scheme of successive predications, extended indefinitely, with all the possibilities... | |
 | James Burt Miner - Children with disabilities - 1918 - 382 pages
...standard deviation regarded as unity. This SD is the best measure of the scatter of the deviations. It is the square root of the average of the squares of the deviations of the separate measurements from the average of all the measurements. There are approximately four units... | |
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The standard deviation, mathematically, is the square root of the average of the squares of the deviations of the individual cases from the mean. 
