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This suggests that it is best (sample size permitting) not to combine the overweight and obese categories, as associations with obesity may be missed.
Because the prevalence of malaria was not well known in the area, a 50% estimate, which gives the best sample size, was used for the peak-transmission season, and a 25% estimate was used for the low-transmission season.
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For the general cases, the best sample sizes are nX¯="3 or 4, and nCUSUM=2 or 3.
It is the best when sample size is greater than 300, and it is the worst for small sample size around n = 10.
Coalescent-based programs perform best when sample sizes are low [ 59], so we limited our analyses to 20 individuals per population.
In particular, the combination RHC for the selection of first stage units (fsu's) and systematic sampling for the selection of second stage units (ssu's) perform the best when the sample size is small where as the RHC and SRSWOR perform the best when the sample size is large.
Further testing are indeed required also to decide on best sample number and size in order to reach a compromise with the criterion for low invasiveness.
The best proxy of sample size available in the original study (Taylor et al., 2014) is the number of mtDNA copies isolated from each sample.
The results indicate that for the easiest problem (ER), the predictor seems to perform at its best with a sample size around 80 to 100.
The original calculation was retained as the best indicator of sample size available in the absence of other data to perform a revised power calculation.
A 3D SGE sequence with the parameters: TR = 10 ms, TE = 3 ms, FA = 10 °, voxel size = 120 × 120 × 120 μm and NEX = 10 resulted in the best fitting for sample size, image quality, scanning time and artifacts.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com