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CIcalculator - CONFIDENCE INTERVAL CALCULATOR(v4 November...

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CONFIDENCE INTERVAL CALCULATOR (v4, November 2002) This spreadsheet can be used to calculate confidence intervals for a mean, the difference betweeen two means, a proportion o comparisons of two proportions (the absolute risk reduction, number needed to treat, relative risk, relative risk reduction and od sensitivity, specificity and two-level likelihood ratios. Click on the tabs at the bottom of this screen to choose the appropriate wo The confidence interval for the difference between two means uses the method that assumes equal variances for the two popu (see Armitage P and Berry G (1994): Statistical Methods in Medical Research (3rd ed.). London: Blackwell, pp 108-109). The method used to calculate a confidence interval for a proportion is the Wilson score method without continuity correction (s Newcombe RG (1998). Two-sided confidence intervals for the single proportion: Comparison of seven methods. Statistics in M 17, 857-872). The method used to calculate a confidence interval for the difference between two proportions is the Newcombe-Wilson metho continuity correction (see Newcombe RG (1998). Interval estimation for the difference between independent proportions: Com eleven methods.
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