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However, non-significant does not mean that there is no effect in given sample sizes but small sample size will usually report non-significant even when there are significant valid effects which a large data sample would have reported but sometimes large sample sizes also report non significance.
IDA and CStaR aim at deriving valid effects by identifying the true parents of the node X.
Underpowered studies in this regard suffer from a major problem: the chance to detect valid effects is too low to be reliable in any kind.
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Exposure estimates with minimal measurement error are necessary to produce valid effect estimates.
Such mainly individual and educational interventions are better suited for evaluation in RCTs enabling internally valid effect estimates.
A valid effect estimate indicating a higher rate with tiotropium means that tiotropium increases risk more than LABA but both drugs could be either increasing or decreasing risk.
To ensure a valid effect estimate, this should be based on a high quality study or on meta-analysis if enough high quality data is available to carry out such analysis.
When assessing attributable fraction, the estimate of exposure should be accurate in terms of giving a valid effect estimate, but it does not need to be representative of the entire population.
There is a modicum of support for the use of oxytocin as an adjunct to antipsychotic drugs [ 11] but whether this latest finding is a valid effect remains a matter of conjecture.
Insulin production was earlier hypothesized as a valid effect of VA administration in diabetic condition [ 13] and insulin is known to favour tissue storage of the fuel molecules including TGs.
For a valid effect to have been demonstrated in Greer et al.'s [ 11] more modest sample of 57 women with early breast cancer, effects of a fighting spirit would have to be even much stronger than most known biological factors or treatments.
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