Sentence examples for standard power calculation from inspiring English sources

To compare astigmatic outcomes in patients with bilateral cataracts having toric intraocular lens (IOL) implantation with intraoperative aberrometry measurements in 1 eye and standard power calculation and a toric IOL calculator with inked axis marking in the contralateral eye.

To determine the appropriate sample size for this study we used a standard power calculation for adequate sensitivity (Jones et al., 2003).

Where measures are repeated to improve precision, decisions about the number of repeated measures, that is, the number of within-patient observations, mirror those of standard power calculation, which concerns observations of separate patients.

By our calculation, even the largest of them, 12 with data from just 1175 participants, only had sufficient statistical power to detect a mortality difference if hip cement was causing one additional death for every 25 patients treated (based on standard power calculation variables α=0.1 and β=0.8, and mortality among the uncemented group of 6%).

In fact, when the functional variables are explicitly modelled, linear regression has >80% power to detect the gene-gene interaction effects simulated here (n = 2000, sr main = 0.01, sr interaction = 0.05), determined using standard power calculation techniques for gene-gene interaction [ 70, 71].

In whole genome scans, standard power calculations show that up to 1000 participants are required to detect major gene main effects and at least 4,000 samples are required to detect small effects [35].

We performed standard power calculations assuming α = 0.05, thus giving an indication regarding the general power of our study.

The article makes the point that some situations are complicated enough that standard power calculations do not capture the whole picture, because they require simplifying assumptions that may not hold.

As a proof of concept, IOL power for 19 normal subjects has been calculated and the differences between our results and standard IOL power calculation methods have been analyzed.

In order to meet current standards of power calculation in cluster randomised trials we performed an additional calculation considering intraclass correlation.

The sample size was estimated using standard sampling power calculations [ 37].