Centering or not centering in multilevel models? The role of the group mean and the assessment of group effects

Article Abstract:

The main contributions in terms of meaning, assumptions, and effects underlying a multilevel centering solution are reviewed, emphasizing advantages and critiques of this approach and contextual and correlated effects in a multilevel framework are defined to detect group effects. The decision of centering in a multilevel analysis depends on the way the variables are centered, on whether the model has been specified with or without cross-level terms and group means, and on the purposes of the specific analysis.

Models, Regression analysis, Decision-making, Group, Group decision making

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The race gap in support group participation by breast cancer survivors: real or artifact?

Article Abstract:

A study evaluates whether there really exists a racial disproportion in the involvement of African American and European American women in breast cancer support groups. Research reveals no such difference, but proposes the need for more analytical techniques to sufficiently portray the experiences and requirements of specifically African American women breast cancer survivors.

Science & research, Research, African Americans, Breast cancer, Racism

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A METHOD TO OBTAIN A RANDOMIZED CONTROL GROUP WHERE IT SEEMS IMPOSSIBLE

Article Abstract:

The author examines techniques of randomization used in a study of a smoking secession program. Information on selection of control groups, evaluation standards, and conflicts of dual purpose research studies are examined.

Statistical Data Included, Methods, Evaluation, Smoking cessation programs, Smoking cessation, Methodology, Research methods, Program Evaluation and Review Technique

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