Comparing J independent groups with a method based on trimmed means

Özdemir, A. Fırat; Wilcox, Rand R.; Yildiztepe, Engin

doi:10.1080/03610918.2017.1295152

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…25 For continuous variables, a robust alternative to the t -test, the Yuen–Welch test T y , based upon 10% trimmed means and Winsorized variances alongside percentile-t bootstrapping (2000 bootstrap samples), was used. 26…”

Section: Methodsmentioning

confidence: 99%

Assessing implementation fidelity in the First Episode Rapid Early Intervention for Eating Disorders service model

et al. 2021

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Background The First Episode Rapid Early Intervention for Eating Disorders (FREED) service model is associated with significant reductions in wait times and improved clinical outcomes for emerging adults with recent-onset eating disorders. An understanding of how FREED is implemented is a necessary precondition to enable an attribution of these findings to key components of the model, namely the wait-time targets and care package. Aims This study evaluated fidelity to the FREED service model during the multicentre FREED-Up study. Method Participants were 259 emerging adults (aged 16–25 years) with an eating disorder of <3 years duration, offered treatment through the FREED care pathway. Patient journey records documented patient care from screening to end of treatment. Adherence to wait-time targets (engagement call within 48 h, assessment within 2 weeks, treatment within 4 weeks) and care package, and differences in adherence across diagnosis and treatment group were examined. Results There were significant increases (16–40%) in adherence to the wait-time targets following the introduction of FREED, irrespective of diagnosis. Receiving FREED under optimal conditions also increased adherence to the targets. Care package use differed by component and diagnosis. The most used care package activities were psychoeducation and dietary change. Attention to transitions was less well used. Conclusions This study provides an indication of adherence levels to key components of the FREED model. These adherence rates can tentatively be considered as clinically meaningful thresholds. Results highlight aspects of the model and its implementation that warrant future examination.

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Section: Methodsmentioning

confidence: 99%

Assessing implementation fidelity in the First Episode Rapid Early Intervention for Eating Disorders service model

et al. 2021

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“…Karagoz and Saracbasi (2016) proposed the robust Brown-Forsythe tests based on median/MAD and median/Q n to test the equality of Weibull distributed group means in the presence of outliers. Ozdemir et al (2018) proposed the B 2 tj test based on bootstrapped trimmed means. Yusof et al (2013) proposed the trimmed F-test combined with the robust scale estimators to overcome the problem of inflating Type I error on testing equality of group means for skewed distributions.…”

Section: Introductionmentioning

confidence: 99%

A revised generalized F-test for testing the equality of group means under non-normality caused by skewness

Çavuş¹,

Yazıcı²,

Sezer³

2021

Communications Faculty of Science University of Ankara Series A1Mathematics and Statistics

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The non-normality may occur in the data due to several reasons such as the presence of the outlier or skewness. It leads to lose the power and fail control Type I error probability of the tests which are used to test the equality of the group means under heteroscedasticity. To overcome this problem, a revised generalized F-test (RGF) is proposed to test the equality of group means under heteroscedasticity in which non-normality is caused by skewness in this study. An extensive Monte-Carlo simulation study is conducted to investigate and compare the performance of the proposed test with non-parametric alternatives under several values of skewness, and different number of groups. The proposed RGF is the best choice in the high level of skewness for k = 3, 4, 5. The Kruskal-Wallis test shows better performance than the others in small and moderate sample sizes for k = 6, and 7. It is shown that the proposed RGF test is superior than the non-parametric alternatives in the most of the conditions.

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One-Way and Higher Designs for Independent Groups

Wilcox

2022

Introduction to Robust Estimation and Hypothesis Testing

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Comparing J independent groups with a method based on trimmed means

Cited by 4 publications

References 2 publications

Assessing implementation fidelity in the First Episode Rapid Early Intervention for Eating Disorders service model

Assessing implementation fidelity in the First Episode Rapid Early Intervention for Eating Disorders service model

A revised generalized F-test for testing the equality of group means under non-normality caused by skewness

One-Way and Higher Designs for Independent Groups

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