Although non-response bias in the focus groups may have been a concern, purposive sampling was used to identify and recruit members to the focus groups and in the smallest groups representativeness was maintained.
Here's my two cents: all this debate about statistical representativeness, small datasets, only a handful of companies, and sites being chosen by the gas companies misses a key result -- perhaps the most important one.
The response rate in the Norwegian survey was satisfactory, and the effect of non-response was small indicating adequate representativeness.
Study limitations include the potential for bias because of the small sample size, representativeness of the sample, and the possibility of inaccuracies in respondents' self-reported time estimation of warfarin-related procedures.
A sample size of 10 ICUs was however small, with any representativeness to the Australian and New Zealand context probably confined to tertiary-level units; note also that only New Zealand ICU was involved.
This study was subject to several limitations, including the potential for bias due to a small sample size, representativeness of the sample, and the possibility of inaccuracies in self-time estimation by respondents because of human error or overlap of warfarin-related tasks with routine physical assessments.
Therefore, these species have smaller areas of representativeness than species with weak surface fluxes and long lifetimes.
The small sample size limits representativeness and generalizability to the larger school population in the district.
The Dutch database is relatively small, but aimed at representativeness for the whole country.
However, the mean age and sex differences between the twins, singletons and the Colombo census statistics are small so the overall representativeness is good.
