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Zimmerman, Donald W.; Williams, Richard H. – Educational and Psychological Measurement, 1982
Changes, like single scores, are demonstrated to be valid and reliable and potentially predictable by independent variables. Change and growth measures determined from individual examinees' test scores indicated excellent predictive value. (Author/PN)
Descriptors: Change, Correlation, Predictive Measurement, Predictive Validity
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LeBlanc, William G.; Williams, Richard H. – Educational and Psychological Measurement, 1997
The Statistical Analysis System was used to program a statistical procedure developed by K. J. Levy (1975). The focus was on Dunnett-like pairwise multiple comparisons among sample variances. An example using data from G. Glass and K. Hopkins (1996) is used to illustrate a computer run with this program. (Author/SLD)
Descriptors: Comparative Analysis, Computation, Sampling
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LeBlanc, William G.; Williams, Richard H. – Educational and Psychological Measurement, 1997
A large sample technique attributed to L. Marascuilo, based on the multiple comparison technique of H. Scheffe, was programmed with the Statistical Analysis System (SAS), focusing on comparisons among independent binomial samples. Use of the SAS program is discussed. (SLD)
Descriptors: Comparative Analysis, Computer Software, Sample Size, Sampling
Peer reviewed Peer reviewed
Williams, Richard H. – Educational and Psychological Measurement, 1992
A QuickBASIC program is described that can be used to conduct Dunnett-like comparisons on a set of independent proportions. The statistical method used, based on Levy's statistical method (1975), is an extension of the well-known Dunnett test for multiple comparisons on means. (Author/SLD)
Descriptors: Comparative Analysis, Computer Software, Computer Software Reviews, Control Groups
Peer reviewed Peer reviewed
Williams, Richard H. – Educational and Psychological Measurement, 1992
A QuickBASIC microcomputer program for conducting Tukey-like pairwise comparisons on "k" independent sample proportions is described. The program can accommodate applications involving equal or unequal sample sizes. Studentized range values are computed and displayed on a computer monitor, each of which represents a simple comparison…
Descriptors: Analysis of Variance, Comparative Analysis, Computer Software, Microcomputers
Peer reviewed Peer reviewed
Williams, Richard H.; Zimmerman, Donald W. – Educational and Psychological Measurement, 1977
The usual formulas for the reliability of differences between two test scores are based on the assumption that the error scores are uncorrelated. Formulas are presented for the general case where this assumption is unnecessary. (Author/JKS)
Descriptors: Correlation, Error of Measurement, Error Patterns, Scores