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- W2016458609 abstract "Dr. Meseguer and colleagues made use of the correlation coefficient as a measure of linear association between sperm parameters and PTRR of motile sperm (1). They found correlations ranging from 0.05–0.18 with nonsignificant P values and concluded that there is no association between these parameters. Although their conclusion might be correct, the lack of association can also be attributed to two other factors: statistical power and random measurement error. In their study, the investigators recruited 122 study participants. We computed a post-hoc power analysis and found a 51.8% power to yield a statistically significant result. This computation assumes that the correlation in the study is 0.18 (the largest correlation estimated in their article). A sample size of 240 is required to achieve 80% power to detect the observed correlation. Moreover, we estimated that given the study sample size, the minimal significant detectable correlation with 80%, power is 0.25, which is above any estimated correlation in their study." @default.
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- W2016458609 date "2004-08-01" @default.
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- W2016458609 title "Measurement error! Communication between content experts and statisticians" @default.
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- W2016458609 doi "https://doi.org/10.1016/j.fertnstert.2004.05.017" @default.
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