A Comparative Study of Tests for Homogeneity of Variances, with Applications to the Outer Continental Shelf Bidding Data

Conover, W. J.; Johnson, Mark E.; Johnson, Myrle M.

doi:10.1080/00401706.1981.10487680

Cited by 684 publications

(221 citation statements)

References 36 publications

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“…All comparisons were planned, except where explicitly stated, and the reported p values are uncorrected. When the test statistic involved a t test between independent samples, the Fligner-Killeen test of the homogeneity of variances between the two groups (Conover et al 1981) was first performed. In the case of unequal variances between the two groups the Welch-Satterthwaite approximation to the degrees of freedom (Satterthwaite 1946) was applied.…”

Section: Statistical Analysesmentioning

confidence: 99%

Subcortical Plasticity Following Perceptual Learning in a Pitch Discrimination Task

Carcagno

Plack

2010

JARO

134

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Practice can lead to dramatic improvements in the discrimination of auditory stimuli. In this study, we investigated changes of the frequency-following response (FFR), a subcortical component of the auditory evoked potentials, after a period of pitch discrimination training. Twenty-seven adult listeners were trained for 10 h on a pitch discrimination task using one of three different complex tone stimuli. One had a static pitch contour, one had a rising pitch contour, and one had a falling pitch contour. Behavioral measures of pitch discrimination and FFRs for all the stimuli were measured before and after the training phase for these participants, as well as for an untrained control group (n=12). Trained participants showed significant improvements in pitch discrimination compared to the control group for all three trained stimuli. These improvements were partly specific for stimuli with the same pitch modulation (dynamic vs. static) and with the same pitch trajectory (rising vs. falling) as the trained stimulus. Also, the robustness of FFR neural phase locking to the sound envelope increased significantly more in trained participants compared to the control group for the static and rising contour, but not for the falling contour. Changes in FFR strength were partly specific for stimuli with the same pitch modulation (dynamic vs. static) of the trained stimulus. Changes in FFR strength, however, were not specific for stimuli with the same pitch trajectory (rising vs. falling) as the trained stimulus. These findings indicate that even relatively low-level processes in the mature auditory system are subject to experience-related change.

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Section: Statistical Analysesmentioning

confidence: 99%

Subcortical Plasticity Following Perceptual Learning in a Pitch Discrimination Task

Carcagno

Plack

2010

JARO

134

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“…Both the Fstatistic and the Brown-Forsythe statistic indicate significance of the difference. The latter test statistic is more robust under non-normality (Brown andForsythe, 1974, Conover, Johnson andJohnson, 1981).…”

Section: Resultsmentioning

confidence: 99%