This is a must have study guide for Biostatistics, from a student's perspective. Cram Just the FACTS studyguides give all of the outlines, highlights, notes, and quizzes for your textbook with optional online comprehensive practice tests.
Only Cram is Textbook Specific. Accompanys: This text book has been written in a simple and easy to understand language and presents a broad collection of data analysis techniques. Skip to content. It prepares students for their future courses and careers by introducing the statistical methods most often used in medical literature.
Rosner minimizes the amount of mathematical formulation algebra-based while still giving complete explanations of all the important concepts. Options are available for conducting all possible pairwise comparisons between indirect effects that can be constructed linking an X to a Y through an M.
Bootstrapping methods are available for inference about indirect effects and differences between them. MEDYAD allows up to twelve mediators up to six measured on each member of the dyad, or twelve if each mediator measures an aspect of the relationship or a single member of the dyad and can conduct contrasts between indirect effects within and between dyads and between and within mediators.
MEDYAD also allows for the specification of an X or Y that measures a property of the dyad rather than of the individual member of the dyad. Numerous additional options are available, including options for controlling for covariates and saving bootstrap estimates of effects for further analysis. Use omega rather than Cronbach's alpha for estimating reliability.
Communication Methods and Measures , 14 , Yet methodologists have warned that a is not an optimal measure of reliability relative to its more general form, McDonald's omega. Hindering its more widespread adoption is the fact that the computation of omega heretofore has required the estimation of item factor loadings and error variances in a confirmatory factor analysis CFA.
The OMEGA macro also generates all possible subscales of at least three items from an additive scale containing k items. For each possible subscale, it generates omega and the subscale-full scale correlation and displays information about each subscale in a data spread sheet.
It also generates summary statistics making it easy to find the most psychometrically appealing brief form of a longer measurement instrument. Most of the features available for omega are also available for Cronbach's alpha, which the OMEGA macro can also generate. Two condition within-participant statistical mediation analysis: A path-analytic framework.
Psychological Methods , 22 , In a path-analytic form using OLS regression, it implements the method described by Judd, Kenny, and McClelland , Psychological Methods , extended to multiple mediators.
Along with an estimate of the indirect effect s , MEMORE generates confidence intervals for inference about the indirect effect s using bootstrapping, Monte Carlo, or normal theory approaches. MEMORE also provides an option that conducts pairwise contrasts between specific indirect effects in models with multiple mediators. RLM Darlington, R. Regression analysis and linear models: Concepts, application, and implementation. It can be downloaded from the book's web page and is documented in Appendix A of the book.
In addition to the usual regression program output, it has options for heteroscedasticity-consistent inference using either the HC0, HC1, HC2, HC3, or HC4 variance-covariance matrix , automatic coding of a multicategorical categorical regressor, options for estimating and probing interactions involving a multicategorical regressor, all subsets regression, spline regression, crossvalidation indices for the multiple correlation, an implementation of a limited form of dominance analysis, contrasts between regression coefficients, and a few other features.
Conditional process analysis: Concepts, computation, and advances in the modeling of the contingencies of mechanisms. A tutorial on estimating, visualizing and probing an interaction involving a multicategorical independent variable in linear regression analysis.
It was written by Amanda Montoya and is described, tested, and documented in Montoya The paper referenced above illustrates its use. The archive contains five folders, one for each macro. I no longer support or respond to questions about these macros.
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