Social media, for example, is a rich source of information, but comes with demographic and socio-economic sampling.
Our aims were to (1) generate unbiased estimates of brown hyaena occupancy and abundance (2) investigate two suspected determinants of occupancy using a combination of biological and socio-economic sampling techniques, and (3) use simulations to evaluate the effort required for abundance and occupancy estimates with acceptable bias, precision and power.
The economic evaluation sample comprised 4201 women, of whom 2219 had been randomised to cytological surveillance, 982 to colposcopy with immediate treatment, and 1000 to colposcopy with biopsy and recall.
For that reason, the schools should be selected from different neighbourhoods of various socio-economic statuses that assure recruitment of higher and lower socio-economic statuses sample.
Once a location shows evidence for an economic deposit, samples are drilled and sent for geochemical analysis.
14 A stratified cluster (in terms of demographic and social economic diversity) sampling strategy was used to select study participants.
The socio-economic survey sampled 20 respondents per village, using cluster sampling to select the households to be interviewed (Dunford 2003).
Limited computer access or computer-illiteracy may restrict participation, creating a digital divide between the 'have nets' and the 'have nots', thus leading to age or socio-economic status sampling bias [ 2- 6, 41, 50].
The effectiveness and accuracy of biomonitoring programs, based on benthic macroinvertebrates, is strictly related to the sampling design and effort, whereas the feasibility depends on the economic sustainability of sample collection and processing methodologies.
The DLLME is a simple, fast, efficient, environmentally-friendly and economic method for sample preparation (Rezaee et al. 2006; Nagaraju and Huang 2007; Shamsipur and Fattahi 2011).
