The basic rule of sampling is that if a track starts to show signs of getting big, labels will rush to license it and clear the offending sample, or samples, in question.
We used only left jaws for DNA extraction to rule out the possibility of sampling the same individual twice.
In the presence of a spatial dependence, the observation made at one location is more similar to observations made at nearby sites [ 2], breaking the rule of sample independence for statistical analyses [ 23].
As is the custom in this column, this survey is blissfully unscientific, following no particular rules of statistical sampling.
Havran and Sbert [9, 10] introduce a heuristic for unbiased techniques based on assigning a count of samples proportional to the inverse of the variance of each technique that in some cases seemed to put into question the quasi-optimality rules of equal sampling.
EFs are to be quantified by in-situ assessments in forest stands, which follow the rules of probabilistic sampling theory.
However, a spill-over cannot be completely ruled out because the number of sampled piggeries was low, mating had been documented in only few of them, and the origin of the brucellosis outbreak could not be definitely elucidated.
A set of rules of thumb on sampling design and survey operations suggested by the United Nations (2008) was also followed in the survey in order to avoid bias in sample selection and data collection, respectively.
We determined our sample size by an a priori set-up stopping rule of a sample size typically employed to detect an interactivity effect in previous experiments (for example, Allen & Vallée-Tourangeau, 2016; Vallée-Tourangeau, 2013).
Many collections rely on simple, broadly-applied rules-of-thumb for minimum sample sizes, regardless of species' natural history, and are likely inadequate for obtaining sufficient genetic representation.
Although rules of thumb regarding sample size for EFA have not yet been established, one common rule of thumb is a sample size of at least 100 [ 26] and another is a subject-to-item ratio of 10 1 [ 27].
