sample size


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Related to sample size: sampling techniques

sample size

(1) A subset of a larger population, selected for investigation to draw conclusions or make estimates about the larger population.
(2) The number of subjects in a clinical trial.
(3) Number of subjects required for primary analysis.
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References in periodicals archive ?
[2] proved a limit theorem stating that [bar.X] converges to a Gamma distribution as the sample size n grows large and the dispersion parameter [theta] approaches zero.
In order to improve the quality of research findings, this article attempts to contribute to the derivation and evaluation of sample size methodology for two-sample t tests in two important and distinctive aspects.
In this case, the researcher identifies that a medium effect size ([R.sup.2] = .13; Cohen, 1992), with an alpha level of .05 and power at .80, would require a sample size of at least 77 participants.
This current study represents the first investigation, to the authors knowledge, to explore the sample size requirements that would inform a translation/adaptation and/or validation for the schizophrenic quality of life scale revision 4 (SQLS-R4, 6).
I hope you have enjoyed this series on the vagaries of capability studies (Cp versus Pp, data distribution, and sample size).
However, as increasing sample size implies higher cost for studies, power is generally set at some reasonable level such as 0.80.
We followed a 2-step procedure to address the 2 topics presented in the preceding paragraphs: 1) how to distribute age-composition sample sizes across species on a statistical or biological basis, and 2) what is the effect on SCAA model uncertainty for species with different life histories by increasing or decreasing age-composition sample size.
However, RMSEA seems to be somewhat dependent on sample size, when sample size is lower than N = 400 in the case of k = 10 and lower than 300 in the case of k > 10.
The results of estimated percentage relative efficiencies in the comparable sample sizes in (Table 6) showed the inferior performance of usual estimators under srswordueto the larger variances of the networks of the variable of study.
According to the company, the sample size reassessment was included as part of the protocol to confirm that the original assumptions are in line with the study and that the sample size is adequate.