Analysis of repeated measurements

Rogan, Joanne C.; Keselman, H. J.; Mendoza, John E.

doi:10.1111/j.2044-8317.1979.tb00598.x

Cited by 147 publications

(79 citation statements)

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“…459-460) and Anderson (1958, p. 259) provide statistical tests that may be used to test the assumption of sphericity. However, on the basis of the results of Monte Carlo studies by Keselman, Rogan, Mendoza, and Breen (1980) and Rogan, Keselman, and Mendoza (1979), these tests do not appear worth doing, because they are highly sensitive to departures from multivariate normality and from their respective null hypotheses. The test described by Bock (1975) is available as an option from SPSS (MANOVA), and the test described by Anderson (1958) is output by BMDP2V.…”

Section: Univariate Modementioning

confidence: 92%

Decisions in Single Group Repeated Measures Analysis: Statistical Tests and Three Computer Packages

Barcikowski

Robey

1984

The American Statistician

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Repeated measures analysis is a widely used tool of applied statisticians. However, its users are confronted with what seems to be a myriad of decisions, even in its simple application. Should a univariate or a multivariate mode be used? Should an adjusted univariate test be used, and if so, which one? Should a pooled or partitioned error term be used? How important is the sphericity test? Given answers to these questions, which of three major statistical packages, and which programs within a package, could be used? These questions are discussed and resolved in this presentation.

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Section: Univariate Modementioning

confidence: 92%

Decisions in Single Group Repeated Measures Analysis: Statistical Tests and Three Computer Packages

Barcikowski

Robey

1984

The American Statistician

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“…Departures from sphericity can strongly bias the results of repeated-measures ANOVAS as well as the results of planned comparisons involving repeated measures (Rogan, Keselman, & Mendoza, 1979;Vasey & Thayer, 1987). For this reason, where sphericity assumptions are violated, F values are reported with the conservative degrees of freedom recommended by Greenhouse and Geisser (1959).…”

Section: Discussionmentioning

confidence: 99%

Selective associations in the observational conditioning of fear in rhesus monkeys.

Cook

Mineka²

1990

Journal of Experimental Psychology: Animal Behavior Processes

161

117

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Three experiments explored the issue of selective associations in the observational conditioning of fear. Experiment 1 results indicated that observer rhesus monkeys acquired a fear of snakes through watching videotapes of model monkeys behaving fearfully with snakes. In Experiment 2, observers watched edited videotapes that showed models reacting either fearfully to toy snakes and nonfearfully to artificial flowers (SN+/FL-) or vice versa (FL+/SN-). SN+/FL-observers acquired a fear of snakes but not of flowers; FL+/SN-observers did not acquire a fear of either stimulus. In Experiment 3, monkeys solved complex appetitive discriminative (PAN) problems at comparable rates regardless of whether the discriminative stimuli were the videotaped snake or the flower stimuli used in Experiment 2. Thus, monkeys appear to selectively associate snakes with fear.

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“…These were the multivariate analogue a to repeated measures ANOY A and two df-eorrected F tests, the Greenhouse-Geisser and Huyn-Feldt F tests (Rogan, Keselman, & Mendoza, 1979). Fortunately, the results of all three were always in agreement.…”

Section: Discussionmentioning

confidence: 62%

The Fraser illusion: Simple figures

Stuart

Day

1988

Perception & Psychophysics

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The Fraser illusion occurs when a line formed from a number of tilted segments itself appears tilted. Two explanations of this illusion were examined: (1) that the illusion results from lateral facilitation between orientation selective cells, and (2) that it is due to orientation being processed only at a local level. In Experiment 1, variations in the strength of the Fraser illusion and a comparable Zollner illusion, with change in the angle of inducing elements, were examined. There were no differences between the angular functions, but it was shown that in both cases assimilation occurred at angles as great as 18°and that solid figures showed weaker contrast illusions at larger angles. Experiment 2 indicated that this might be due to the different Fourier composition ofthe solid figures. Experiment 3 measured the local effects oflateral inhibition/facilitation and confirmed that facilitation did not take place. That indicates that the illusion results from the direct contribution oflocal information provided by the tilted segments to the global perception of the line. Finally, Experiment 4 showed that when the amount of background field used in the Zollner illusion was increased, it became negative at smaller angles, due to the increased contribution of lateral inhibition.The Fraser illusion was first described by James Fraser in 1908. A simple version of the illusion is shown in Figure la. In this figure, the letters of the word LIFE appear to be tilted with respect to one another. Physical measurement of this figure reveals that the apparent tilt is a powerful visual illusion. The illusion seems to be due to the influence of the tilted elements that make up the lines. The orientation of the elements somehow seems incorporated into the orientation of the letters as a whole.

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Analysis of repeated measurements

Cited by 147 publications

References 0 publications

Decisions in Single Group Repeated Measures Analysis: Statistical Tests and Three Computer Packages

Decisions in Single Group Repeated Measures Analysis: Statistical Tests and Three Computer Packages

Selective associations in the observational conditioning of fear in rhesus monkeys.

The Fraser illusion: Simple figures

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