For each of these samples, the multivariate logistic models were fit, and the G-computation method was used to calculate the risk differences between study groups.
In one study using serum samples, the multivariate ORs of prostate cancer among men with middle concentrations of oxychlordane and PCB 180 were more than three times those among men with the lowest concentrations, without a linear dose response (Ritchie et al. 2003).
To maximise sample size, the multivariate analysis was confined to maternal predictor variables, since these were available for all families.
Due to exclusion of parents with missing values for some explanatory variables, the samples for the multivariate analyses are a little smaller than their corresponding samples for the descriptive analyses.
Dispersal distance and direction was determined by sampling from the multivariate normal distribution.
To do this, we generate B bootstrap samples from the multivariate normal distribution, where is the covariance matrix of.
Linear Discriminant Analysis (LDA) [ 19], a Bayesian classification method, provided the classification of the samples considering the multivariate structure of the data.
The score plot depicted in Figure 3B shows the location of the LL muscle and SAT samples in the multivariate space of the first two PCs.
ϕ = 0 corresponds to no correlation between the random values sampled (from the multivariate lognormal distribution U1) for adjacent years; for those simulations, the Monte Carlo simulation curves are more jagged.
Another limitation is the small sample size for the multivariate regression with a stratified sample, perhaps due to the fact that individuals were being re-contacted one year after they participated in the initial study.
From the analysis of Figure 2(b), we can see that glucose characterizes t0 samples; lactate describes the multivariate space where samples t12 and t18 lie, and hypoxanthine, myo-inositol, and total glutathione (in its reduced, GSH, and oxidized, GSSG, forms) describe the region of t18 and t24 samples.
