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The Reliability of Speeded Tests

Author(s):
Gulliksen, Harold O.
Publication Year:
1949
Report Number:
RB-50-08
Source:
ETS Research Bulletin
Document Type:
Report
Page Count:
16
Subject/Key Words:
Test Reliability, Test Speededness, Timed Tests

Abstract

Some methods are presented for estimating the reliability of a partially speeded test without the use of a parallel form. The effect of these formulas on some test data is illustrated. Whenever an odd-even reliability is computed, it is probably desirable to use one of the formulas noted in Section 2 of this paper in addition to the usual Spearman-Brown correction. Since the formulas given here involve the mean and standard deviation of the "number unattempted score", a method is given in Section 4 for computing this mean and standard deviation from item analysis data. If the item analysis data are available, this method will save considerable time as compared with rescoring answer sheets.

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