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"Sixty high-yield pediatrics cases help you sharpen your diagnostic and problem-solving skillsYou need exposure to high-yield cases to excel on the pediatrics clerkship and the shelf-exam. Case Files: Pediatrics presents sixty real-life cases that illustrate essential concepts. Each case includes complete discussion, clinical pearls, references, definitions of key terms, and USMLE-style review questions with detailed explanations of the correct answers. With this system, you'll learn in the context of real patients, rather than merely memorize facts"--Provided by publisher.
Pediatrics --- Pediatrics --- Methods --- Methods
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This study examined the type I error and power properties of usual ANOVA, rank transform and aligned rank transform methods in the context of a balanced 2 x 4 fixed-effect layout. Different versions of F-test and Kruskal-Wallis test are used with four transformations (ranks, Blom normal scores, Van der Waerden normal scores, Savage scores) and three techniques of alignment (least-square, Lehmann, medians). In order to compare the robustness and the power of tests, simulations were employed for a variety of situations (absence or presence of nuisance parameters, small or large sample size, normality or non normality, equal or unequal variances). This study also examined these properties after a normal pre-test (moment test on standardized residuals) and a variance pre-test (Bartlett test or Brown-Forsythe test). The results showed that ANOVA is the more robust test among studies methods for all situations. Even if ANOVA has a moderate inflation in the type I error rate for some situations of unequal variances, non parametric alternatives of that study are not recommended for two-way fixed effects layouts.
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