The n samples can be assigned to the strata equally, proportional (i.e., in proportion to strata sizes), optimal (i.e., by strata sizes and strata variances), or by Neyman allocation that in addition to strata size and variance includes the assessment costs per stratum [16].
The n samples can be assigned to the strata equally, proportional (i.e., in proportion to strata sizes), optimal (i.e., by strata sizes and strata variances), or by Neyman allocation that in addition to strata size and variance includes the assessment costs per stratum [ 16].
The model simulates the strata size of 120 m × 120 m (width × height) with the geometric similarity ratio of 60 1.
Data on strata sizes and household sizes for selected EA were obtained and used to calculate weights for individual respondents.
The strata sizes were obtained by applying age-specific lung cancer incidence rates on the district × SEC × age population proportions.
To identify potential sources of heterogeneity between studies and to assess the effect of study characteristics on the results, we repeated the meta-analysis in strata defined by study size, design and method of data collection and ethnicity of participants.
While we are the first to estimate associations between maternal B vitamin and Hcy concentrations and childhood WG, in some, strata sample size was reduced considerably.
The participating general practices were divided in strata according to the characteristics both of the practice and of the GPs (age, gender, practice population size, practice situation, percentage ethnic minorities).
Projects are conducted in North America, Australia, and India in strata ranging in age from Pleistocene to Proterozoic.
We additionally examined the effect of alcohol consumption in strata according to allele carrier status.
