This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...will be measured fully by comparing them item by item; the measurement may be summarized in various ways. The difference between two facts, each of which is measured by its relative position in a series, may be measured most satisfactorily by transmuting the series and then using regular methods, most quickly by the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...will be measured fully by comparing them item by item; the measurement may be summarized in various ways. The difference between two facts, each of which is measured by its relative position in a series, may be measured most satisfactorily by transmuting the series and then using regular methods, most quickly by the gross or percentile difference between the two, rated as members of the same series. The Comparison of Groups. The common custom of comparing groups by comparing their averages is inadequate because for both practical and theoretical purposes the meaning of a difference between two averages depends upon the variabilities of the groups. The mere fact, for example, that in the A test (see page 46) the averages for 12-year-old boys and for 12-year-old girls were respectively 41 and 46, might mean (1) that the lowest ranking girl was above the highest ranking boy, i. e., that boys and girls were in this trait totally distinct species or (2) that only 5 per cent. of girls were better than the highest ranking boy, or even (3) that no girl was equal to the highest ranking boy. It might mean, in fact, all sorts of conditions, some of which are pictured in Figs. 71 to 76. It is of no great advantage to estimate the difference in a per cent. rather than a gross amount. One group may in ten different tests have always an average twenty per cent. higher than the other, and yet the differences in ability may really be equal in no two of the ten cases. For, since in mental and social traits there are rarely absolute zero points at which to start the scale, the meaning of each percentage will depend upon the number chosen as the starting-point in measuring. We can always make a difference so expressed seem less by starting the scale at 10 or 40 or 100 instead ...
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Add this copy of An Introduction to the Theory of Mental and Social to cart. $19.72, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
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Add this copy of An Introduction To The Theory Of Mental And Social to cart. $54.26, new condition, Sold by Booksplease rated 4.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2007 by Kessinger Publishing.
Add this copy of An Introduction To The Theory Of Mental And Social to cart. $54.33, new condition, Sold by Booksplease rated 4.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2010 by Kessinger Publishing.
