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Relationships between the Item Difficulty and Discrimination Indexes.
Peer reviewed Peer reviewed
Aiken, Lewis R. – Educational and Psychological Measurement, 1979
The dependence of item discrimination index (D) on item difficulty index (p), and the relationship of D and p to the phi coefficient are delineated. A table of critical values of D significant at the .10 and .05 levels, with p ranging from .10 to .90, is presented. (Author/CTM)
Descriptors: Correlation, Item Analysis, Statistical Significance, Tables (Data)
Repeated Measures and Mixed Designs ANOVA Using SPSS.
Aiken, Lewis R. – 1979
Although the Statistical Package for the Social Sciences (SPSS) contains no subprogram that is complete in itself for analyzing repeated measures or mixed designs analysis of variance, subprogram ANOVA can be used to obtain almost all the required sums of squares for repeated measures designs, mixed designs having repeated measures on some…
Descriptors: Analysis of Variance, Computer Programs, Research Design, Statistical Significance
Difference Tests for Distributions of Ratings.
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Aiken, Lewis R.; Aiken, Timothy A. – Educational and Psychological Measurement, 1986
Three exact probability tests, counterparts of t tests for single sample, independent samples, and dependent samples, are described for data obtained from ratings on "m" scales by a single rater or on a single scale by "n" raters. (LMO)
Descriptors: Nonparametric Statistics, Probability, Rating Scales, Statistical Distributions
Evaluating Ratings on Bidirectional Scales.
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Aiken, Lewis R. – Educational and Psychological Measurement, 1985
Procedures are described for determining the statistical significance of a set of ratings made on bidirectional (B) scales. B and its statistical significance can be determined on samples of items or raters. The statistical significance of a mean of B values can be assessed by applying a normal approximation test. (Author/DWH)
Descriptors: Higher Education, Rating Scales, Research Methodology, Scoring
Coefficients of Response Homogeneity and Congruence.
Peer reviewed Peer reviewed
Aiken, Lewis R. – Educational and Psychological Measurement, 1989
Two coefficients ("H" and "C") for evaluating the homogeneity or congruence of a set of ratings or scores are described. Statistical tests of the significance of these indexes are presented, along with a description of a computer program (CHOPRO) for determining values of "C" and "H" and associated…
Descriptors: Computer Software, Congruence (Mathematics), Equations (Mathematics), Mathematical Models
Content Validity and Reliability of Single Items or Questionnaires.
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Aiken, Lewis R. – Educational and Psychological Measurement, 1980
Procedures for computing content validity and consistency reliability coefficients and determining the statistical significance of these coefficients are described. Procedures employing the multinomial probability distribution for small samples and normal curve probability estimates for large samples, can be used where judgments are made on…
Descriptors: Computer Programs, Measurement Techniques, Probability, Questionnaires
Some Measures of Interpersonal Attraction and Group Cohesiveness.
Peer reviewed Peer reviewed
Aiken, Lewis R. – Educational and Psychological Measurement, 1992
The computation and determination of the statistical significance of three coefficients of interpersonal attractiveness or cohesiveness in task-oriented or social groups are described. The approach is based on ratings made by each member of a group of all other group members. Experience using the technique is reviewed. (SLD)
Descriptors: Equations (Mathematics), Evaluation Methods, Group Dynamics, Group Membership