model FA values for white matter tracts of interest, we first organized the AFQ output into a data frame which contained the FA value of each tract node for each subject, factors for group and sex, and continuous covariate values; see Supplemental Materials, Table S1 for an example data ...
Background: Daily paediatric asthma readmissions within 28 days are a good example of a low count time series and not easily amenable to common time series methods used in studies of asthma seasonality and time trends. We sought to model and predict daily trends of childhood asthma readmissions ...
For example, a U-shaped relationship was found between fasting plasma glucose (FPG) and SUA levels in individuals with normal glucose tolerance (NGT)[6], but a linearly negative relationship was observed between these variables in diabetic patients[7]. A recent study showed that the association ...
The use of additive and multiplicative hazard models is examined for a cohort study of 2696 women followed up for 12 years. The multiplicative model implie... MJ Campbell - 《Statistics in Medicine》 被引量: 9发表: 1985年 Case-cohort analysis for multiple events time data under general additi...
to be consistent and asymptotically normally distributed.The limiting variance-covariance matrix can be consistently estimated by the nested case-control data.A simulation study is conducted to assess the finite sample performance of the proposed estimator and a real example is provided for illustration....
There would appear, therefore, to be little point in fitting an additive and dominance model to final height. For flowering time there is evidence of epistasis in the first but not in the last two seasons. However, the evidence from other analyses of flowering time presented in section 4 (...
(1) whereΩ⊂Rd,d≥ 1, is a bounded domain,ε> 0 is a constant diffusion coefficient,bis the convection field,cis the reaction field, and the right-hand sidegis a source of the unknown quantityu. Note that the model problem (1) itself has also a clear physical meaning since it...
1) A shared frailty model (with gamma or log-normal frailty distribution) and Cox proportional hazard model. Clustered and recurrent survival times can be studied. 2) Additive frailty models for proportional hazard models with two correlated random effects (intercept random effect with random slope)...
2, Additional file 1: Table S1 and S2), similar conclusions could be drawn for the power comparison between GRM and CAT_ADD tests, for all simulated model. However, the strongest gain in power of GRM test versus CAT_ADD test increased and was obtained for smaller ORs. For example, for ...
A well-known example is smallpox, which was eliminated from the human population by vaccination. Similarly, poliovirus has been eradicated from most countries of the world. The use of vaccines has greatly reduced the burden of human disease caused by several other human viruses (e.g., rubella...