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Estimating Norms by Item Sampling

Author(s):
Lord, Frederic M.
Publication Year:
1961
Report Number:
RB-61-02
Source:
ETS Research Bulletin
Document Type:
Report
Page Count:
13
Subject/Key Words:
Item Sampling Test Construction Test Items Test Length Test Norms

Abstract

If a 70-item test is to be normed for a norms population of 1,000 individuals, is it better to give the entire test to a sample of 100 individuals, or to give different samples of 7 items to each of the 1,000 individuals? When tried out on actual data, the latter, "item-sampling" method was found to provide an estimate of the "true" norms distribution slightly superior to that obtainable in the majority of cases by the former method.

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