In order to make comparisons across a range of ethnic groups, very large samples of each group are needed.
Although it is more time consuming, testing large samples of each host species for a range of bacteria is necessary to accurately assess symbiont diversity both within single species and between them.
The samples were selected as part of an ongoing study of dyslexia from a large sample of families, each with at least two siblings who show symptoms of dyslexia (28, 29).
The strengths of this study include the rigorous statistical procedure used to perform the resampling analysis, the large sample of fibers for each rat with which it was performed, and use of a common laboratory animal model in muscle research.
The most important weakness of the research, however, is that we were unable to include the patient perspective, as it was not possible to survey a sufficiently large sample of patients in each country within the time frame of our study.
However, it is important to appreciate that our sampling scheme involving many loci provides a large sample of the deeper coalescent history of each population because, by definition the coalescent histories of unlinked loci are independent.
The economists David Neumark and Andrew Postlewaite examined the behavior of a large sample of pairs of American sisters, each containing a sister who did not work outside the home.
They each involved taking a large sample of data from digital music listeners and analysing patterns in how their preferences matched their demographic groups.
It examined a large sample of corporations.
A classic study provided a large sample of children with the lesson that their maths ability was not fixed.
