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Biometry (Latest Articles)
Latest indexed articles for 'Biometry'
Articles 11 to 20 of 200:
Geostatistical analysis in clustering fMRI time series.
28 Aug 2009 
Clustering of functional magnetic resonance imaging (fMRI) time series--either directly or through characteristic features such as the cross-correlation with the experimental protocol signal--has been extensively used for the identification of ...
rec_pub_19521974-geostatistical-analysis-clustering-fmri-time-series.htm
The estimation of average hazard ratios by weighted Cox regression.
28 Aug 2009 Often the effect of at least one of the prognostic factors in a Cox regression model changes over time, which violates the proportional hazards assumption of this model. As a consequence, the average hazard ratio for such a prognostic factor is ...
rec_pub_19472308-the-estimation-average-hazard-ratios-weighted-cox-regression.htm
28 Aug 2009 We study the problem of estimation and inference on the average treatment effect in a smoking cessation trial where an outcome and some auxiliary information were measured longitudinally, and both were subject to missing values. Dynamic generalized ...
rec_pub_19462416-estimation-average-treatment-effect-incompletely-observed.htm
A selection model for longitudinal binary responses subject to non-ignorable attrition.
28 Aug 2009 Longitudinal studies collect information on a sample of individuals which is followed over time to analyze the effects of individual and time-dependent characteristics on the observed response. These studies often suffer from attrition: individuals ...
rec_pub_19424960-a-selection-model-longitudinal-binary-responses-subject-non-ignorable.htm
13 Aug 2009 It is necessary for the calculation of sample size to achieve the best balance between the cost of a clinical trial and the possible benefits from a new treatment. Gittins and Pezeshk developed an innovative (behavioral Bayes) approach, which ...
rec_pub_19536745-a-behavioral-bayes-method-determine-sample-size-clinical-trial.htm
13 Aug 2009 In a meta-analysis of diagnostic accuracy studies, the sensitivities and specificities of a diagnostic test may depend on the disease prevalence since the severity and definition of disease may differ from study to study due to the design and the ...
rec_pub_19499551-meta-analysis-diagnostic-accuracy-studies-accounting-disease.htm
Semiparametric ROC surfaces for continuous diagnostic tests based on two test measurements.
13 Aug 2009 We propose a semiparametric method for estimating ROC surfaces for continuous diagnostic tests based on two test measurements. Such a three-class diagnostic problem based on two test measurements arises naturally from some DNA amplification-related ...
rec_pub_19499550-semiparametric-roc-surfaces-continuous-diagnostic-tests-based-two.htm
13 Aug 2009 Progression of a chronic disease can lead to the development of secondary illnesses. An example is the development of active tuberculosis (TB) in HIV-infected individuals. HIV disease progression, as indicated by declining CD4 + T-cell count (CD4), ...
rec_pub_19499549-a-simple-g-computation-algorithm-quantify-causal-effect-secondary.htm
13 Aug 2009 The method of generalized estimating equations (GEE) models the association between the repeated observations on a subject with a patterned correlation matrix. Correct specification of the underlying structure is a potentially beneficial goal, in ...
rec_pub_19472307-a-comparison-approaches-choosing-working-correlation-structures.htm
13 Aug 2009 Trials in which treatments induce clustering of observations in one of two treatment arms, such as when comparing group therapy with pharmacological treatment or with a waiting-list group, are examined with respect to the efficiency loss caused by ...
rec_pub_19472169-varying-cluster-sizes-trials-clusters-treatment-arm-sample-size.htm
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