These early GWAS showed that, with the exception of NOD2, the typical effect size of a Crohn's susceptibility locus was modest (OR < 1.3), such that the loci identified only explain a fraction of the known genetic component of Crohn's disease risk (highlighting the 'missing heritability problem' [60,61]).
For single parameter endpoints such as analysis the requirements of Xi relocation, the variable is sampling time, and the output one of two positions, with typical effect size of 3 and analysis using two sample t-test in Excel.
One of these, the admixture maximum likelihood (AML) test, simultaneously estimates the proportion of associated SNPs and their typical effect size.
OBJECTIVES:Despite the growing use of repetitive transcranial magnetic stimulation (rTMS) as a treatment for unipolar depression, its typical effect sizes have been modest, and methodological and conceptual challenges remain regarding how to optimize its efficacy.
This may seem like a large number, but as the typical effect sizes of the most significant loci in the original WTCCC study was ~1%, and the estimated heritability of CAD is 30-60%, a minimum of 30-60 genes are expected to underline the disease.
Changes of statistical powers with an actual effect size of 0.0238 and three typical effect sizes of 0.1, 0.3, and 0.5 are shown as bold and dashed lines.
For example, Weedon et al (2007) explained that typical effect sizes for variants associated with height are likely to be extremely small and subsequently, linkage analysis would have little power to identify these variants mixture unless thousands of families were included in the study.
The typical effect sizes for individual SNPs were fairly small (~1%) in these studies.
Table 5 demonstrates the sample sizes needed based on the choice of the primary endpoint for arbitrary but typical effect sizes.
Projected sample sizes required to achieve 80% power at a two-sided alpha = 0.05 using control rates and standard deviations observed for the REDOXS Study with arbitrary but typical effect sizes.
