A grouping or blocking of observations can be achieved by using categorical or dummy variables. Examples of categorical variables include gender, country of origin, job title and experimental treatment. This should be contrasted with ordinal variables, such as age class, highest degree attained or a score on a 5-point scale with values comprised between strongly agree and strongly disagree. The...

The author proposes some simple diagnostics for the assessment of the necessity of selected model terms in smoothing spline ANOVA models; the elimination of practically insignificant terms generally enhances the interpretability of the estimates, and sometimes may also have inferential implications. The diagnostics are derived from Kullback-Leibler geometry, and are illustrated in the settings ...

ANOVA decompositions are a standard method for describing and estimating heterogeneity among the means of a response variable across levels of multiple categorical factors. In such a decomposition, the complete set of main effects and interaction terms can be viewed as a collection of vectors, matrices and arrays that share various index sets defined by the factor levels. For many types of cate...

Bayesçi yaklaşım, klasik istatistik yaklaşımının aksine önsel dağılım bilgisi yardımı ile sonsal dağılımı tahmin eden bir yöntemdir. BANOVA gibi yöntemlerde p-değeri yerine farklı kriterlere göre yokluk hipotezi için karar verilir. modelinde sadece genel ortalama terimin mi yer alacağı ya da deneme etkisinin aldığı model geçerlidir araştırmasında, faktör (BF)’e bakılarak seçenek karşılaştırılar...

Eta squared is a popular effect size, but contains positive bias. Bootstrapping can be used to remove the bias from eta squared. Compared epsilon and omega squared, bootstrap correction does not make distributional assumption, it easy implement. A real example computer simulations are included illustrate its application. The bias-corrected shows very...

Increasingly school counselors are being called upon to demonstrate that they contribute to students’ academic achievement. No Child Left Behind (NCLB) has led to an intense focus on the use of standardized test scores in measuring academic achievement and on educator accountability for producing measurable achievement gains. NCLB also calls for all educators to use interventions that have been...