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The Measurement of Ability in Reading: Preliminary Scales and Tests: Limitations to Scale Alpha


by Edward L. Thorndike - 1914

So far, except for a warning at the beginning of the section, Scale Alpha has been described as if the degrees of difficulty (4, 6, 8 and 10) were exact, and as if the different elements of each set were equally difficult to respond to correctly. As a matter of fact, however, it will require an enormous amount of labor to determine at all exactly the relative degrees of difficulty of these different elements; and the 4, 6, 8 and 10 are not much better than convenient guesses. Indeed, I know that the values for these sets will not be at all exactly 4, 6, 8 and 10, that the difficulty of the fourth set will not be exactly two and a half times that of the first. By using fractional numbers I could approach nearer the truth. But I have left the estimates as convenient whole numbers in order to facilitate the understanding and use of the scale.


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Cite This Article as: Teachers College Record Volume 15 Number 4, 1914, p. 57-59
https://www.tcrecord.org ID Number: 10239, Date Accessed: 5/31/2020 1:30:25 PM

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  • Edward Thorndike


 
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