We introduce an approximation to the Gaussian copula likelihood of Song, Li, and Yuan (2009, Biometrics 65, 60-68) used to estimate regression parameters from correlated discrete or mixed bivariate or trivariate outcomes. Our approximation allows estimation of parameters from response vectors of length much larger than three, and is asymptotically equivalent to the Gaussian copula likelihood. W...

The co-twin control design has been widely used in studying the effects of environmental factors on the development of diseases. For binary outcomes that arise from co-twin control studies, the conditional likelihood method is commonly used. This approach, however, does not readily extend to ordinal response data because the standard conditional likelihood does not exist for cumulative logit or...

Goeie kommunikasie is die hoeksteen van die verpleegberoep. Aan die hand van gevalle illustreer die skrywer dat die kind veral gevoelig is vir ’n gebrek aan kommunikasie en dat 'n spesiale poging dus aangewend moet word. Hospitalisasie en veral die skeiding van sy moeder het ’n intense invloed op die kind en sy reaksies hang van verskeie faktore af. Om te voorkom dat die hospitaalervaring horn ...

Interactive technologies provide today’s youth a low stakes sandbox to collect experiences (Gee, 2004) and try tasks and identities (Gee, 1991) that push the boundaries of “known” and open up the world of possibility. Pairing affordances of video games with the possible selves framework (Markus & Nurius, 1986), research involved using The Sims 2 life-simulation properties to encourage a friends...

Correlated response data arise often in biomedical studies. The generalized estimation equation (GEE) approach is widely used in regression analysis for such data. However, there are few methods available to check the adequacy of regression models in GEE. In this paper, a graphical method is proposed based on Cook and Weisberg's marginal model plot. A bootstrap method is applied to obtain the r...

BACKGROUND Incarceration has been associated with a number of health-related harms among injection drug users (IDU). However, little is known about the prevalence and correlates of incarceration among community-based samples of IDU. METHODS We examined the prevalence and correlates of recent incarceration among IDU in the Scientific Evaluation of Supervised Injecting (SEOSI) cohort examined b...

In this paper it is shown that the use of non singular block invariant ma trices of covariates leads to generalized estimating equations estimators GEE estimators Liang K Y Zeger S Biometrika which are identical regardless of the working correlation matrix used Moreover they are e cient McCullagh P The Annals of Statistics If on the other hand only time invariant covari ates are used the e cien...

This paper considers inference methods for case-control logistic regression in longitudinal setups. The motivation is provided by an analysis of plains bison spatial location as a function of habitat heterogeneity. The sampling is done according to a longitudinal matched case-control design in which, at certain time points, exactly one case, the actual location of an animal, is matched to a num...

Model selection is a central component of data analysis Though there are a variety of methods for likelihood based estimation methods there are relatively few for non likelihood based generalized linear models GLM such as in the quasi likelihood and generalized es timating equation GEE approaches In this paper we develop basic and bias corrected bootstrap approaches to estimate the predictive m...

This paper discusses varied ideas on games, learning, and digital literacy for 21st-century education as theorized and practiced by the author and James Paul Gee, and their colleagues. With attention to games as means for learning, the author links Gee’s theories to the learning sciences tradition (particularly those of the MIT Constructionists) and extending game media literacy to encompass “w...