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In this study, we determined a sample size of 49 patients.
Assuming a drop-out rate of 15% and about 10% non-evaluable patients we determined a sample size of 50 subjects to be included.
To avoid a type II error, a preliminary power analysis (power [1-β error probability] =0.8, α=0.05, effect size =0.5) determined a sample size of 30 for this study.
24 In brief, we determined a sample size of 1560 people with standard procedures (α error of 5%, β error of 20%, and 20% losses for independent samples); our final sample included 1307 individuals.
Taking into consideration the effect of the study design, the expected 88% rate of ever experienced sex among the rickshaw pullers in the last 12 months (extrapolated from the trucker results) and the necessity of adjusting possible confounders, we determined a sample size of 600 was required for the study.
Based on the primary variable of this study, which is the mean change in ACQ-5 score from baseline level, we determined a sample size of about 1000 patients in the entire Asian region to give us a 95% confidence interval (CI) with an approximate width of 0.12 units when standard deviation (SD) is 1.0 unit.
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After the protein concentration was determined, a sample-pool for each experimental group was created with a total amount of 80 μg protein.
The design of an acceptance sampling plan consists of determining a sample size n and an acceptance criterion c, where c is the maximum number of defective items that can be found in the sample and the lot still be accepted.
A Bayesian average power criterion is used to determine a sample size that will yield high posterior probability, on average, of a future study correctly deciding in favor of these goals.
Yamane's formulae [ 25] was used to determine a sample size from an estimated female Punjab nurse workforce of 11,065.
Each DT model in DF determines a sample's classification through a series of rules based on selection of predictor variables.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com