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Sensitivity, specificity, confidence intervals, and χ2 test were calculated by web-based statistical calculator made available by Professor Lowry at Vassar College, New York.
The new machine, variously called the "Columbia Machine", the "Statistical Calculator", the "Difference Tabulator", and (because of its massive size) the "Packard", was delivered and installed in 1931.
Analysis was performed using Microsoft Excel or an online statistical calculator [ 22].
All analyses were conducted by using GraphPad Prism software (GraphPad Software, Inc., La Jolla, CA, USA) and the Epi Info statistical calculator (wwwn.cdc.gov/epiinfo).
All analyses were performed using Stata statistical software (version 13.1; StataCorp LP, College Station, Texas) and Episheet, an Excel-based statistical calculator that is available at http://www.krothman.org/Episheet.xls.xls
Similar(55)
In the validation study, sensitivities, specificities and positive (PPV) and negative predictive values (NPV) [19] and Cohen's Kappa scores [20] were calculated using freely available on-line statistical calculators.
Nate Silver's political-statistical calculator, FiveThirtyEight, gives Perriello an 8.5percentnt chance of winning.
Required sample size for hierarchical regression calculated using online statistics calculator was 94 (p = 0.05; desired statistical power = 0.80; and anticipated effect size = 0.15).
All statistical calculations were done using GraphPad QuickCalcs calculator, [ 46].
Statistical analysis was done with one-way ANOVA using online calculator, Statistics Calculator version-3 beta, and the level of significance was set at p value <0.05.
Estimates of statistical power and ideal sample size were obtained using the UCLA Department of Statistics power calculator [ 31, 32] and the SISA statistics calculator [ 33, 34].
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