One common approach used to address this problem is to simply remove occasional species from analyses [14], so inferences are limited to those species that we have most confidence in.
Occasional smoking was analysed by excluding from the analysis the 381 women who admitted that they smoked regularly at the third trimester of pregnancy.
Although our results demonstrate the importance of considering occasional species from some analyses, we do not advocate ignoring them in the identification process.
No differences in socio-demographic, offense or family characteristics where found between persistent high and occasional offenders in bivariate analyses, therefore only externalizing disorders were entered into the regression model.
In subsequent analyses of occasional samples of air filters from the South Carolina plant the authors reported that, "Only two fibers of the 18 840 fiber structures (0.01%) were found to be amphiboles and the remainder were chrysotile based on morphology" (Stayner et al., 2008).
There were occasional significant results in analyses of subsets of the data, for example, 1/ d, 1/ d for leukaemia in E&W alone in the period 1996 2008, but they are counterintuitive, indicating increased risk with increased distance, and we are inclined to regard them also as due to chance.
Some occasional outliers between the two analyses could be due to mutations affecting various other parameters such as cell permeability to the dye, or intracellular structural modifications.
The tribometric results, combined with occasional after-test (ex situ) surface analyses, are evaluated in light of surface physical and chemical data gleaned from the literature.
Our analyses were virtually unchanged: occasional victimisation 1.29 (0.87 to 1.92) and frequent victimisation 2.82 (1.86 to 4.26).
Occasional smokers were classified as never-smokers for the main analyses and analysed separately in secondary analyses.
