Exact(1)
Common methodological problems in genetic association studies include low sample size, chance findings, multiple comparisons and subsequent type I error inflation, different ethnic backgrounds of the study subjects, varying disease definitions and inclusion/exclusion criteria and ascertainment bias.
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But if the company is uploading and saving to that size, chances are it will roll out to general users at some point.
Cluster-wise correction for multiple comparisons was performed by Monte Carlo simulation with 10,000 simulations for estimating the probability of forming a cluster of a given size by chance when clusters were obtained by a vertex-wise threshold of p < 0.005.
More specifically, for each of the 25 known CM domains, we evaluated the empirical probability P of observing an equal or smaller neighborhood size by chance (see Methods).
To tease out whether these correlations were due to a small sample size or chance, the researchers used a more sophisticated statistical technique called principal components analysis, testing the actual results against 10,000 randomly generated simulations.
It is possible that the specific associations reported in this study reflect in part, small sample size and chance findings.
We have shown previously that, clinico-pathologically, increased tumor size and chance of local recurrence were positively related to mRNA level of the tumor [ 8].
The prospective study design reduces the possibility of biased estimates of effect, and the large study size makes chance an unlikely explanation of the main findings.
In statistical parametric mapping (SPM), the correction for multiple comparisons in extent is based on the Euler characteristic which uses the volume, smoothness, and surface area to calculate the expected extent size, by chance, at any given height threshold.
SNPs at the target CpG may be especially problematic in studies with small sample size, as chance may result in dramatic differences in the frequency of polymorphisms between groups.
Nevertheless, in our analysis, LA dimensions did not represent a negative predictor of SR-AC restoring; however, such absence of relationship is partially mitigated by the finding of a bidirectional association between LA size and chance of future AC recovery or, at the opposite, between early atrial "kick" recuperation and more marked future atrial diameter and area decrease.
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