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Both purposeful and simple random sampling procedures were used as techniques for sample selection.
A minority of studies have not demonstrated an association and this may be attributed to significant differences in the methodologies employed for sample selection, immunostaining techniques, vessel counting and statistical analysis, although a number of biological differences may account for the discrepancy.
Based upon these observations, optimal methods for sample selection are proposed and a variety of techniques for age estimation are explored.
Weighted for sample selection and attrition.
Selection term Term constructed from the selection model that controls for sample selection bias.
See Figure 1 for sample selection procedures.
A convenience sampling methodology was employed for sample selection.
In addition, it is necessary for researchers to develop standardized patient recruitment techniques to analyse sample selection bias.
Fig. 1 Flow Chart of Sample Selection for 2007 Cohort.
See the web extra for a detailed explanation of the estimation techniques and sensitivity analysis, as well as further discussion of sample selection.
The number of sampling areas and sample selection techniques applied in the studies increased over the years.
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