faq
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faq [2022/08/03 11:14] – Wolfgang Viechtbauer | faq [2022/08/30 11:18] – Wolfgang Viechtbauer | ||
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!!! By default, the interval is computed with $$\hat{\mu} \pm z_{1-\alpha/ | !!! By default, the interval is computed with $$\hat{\mu} \pm z_{1-\alpha/ | ||
- | Note that this differs slightly from Riley et al. (2001), who suggest to use a t-distribution with $k-2$ degrees of freedom for constructing the interval. Neither a normal, nor a t-distribution with $k-1$ or $k-2$ degrees of freedom is correct; all of these are approximations. The computations in metafor are done in the way described above, so that the prediction interval is identical to the confidence interval for $\mu$ when $\hat{\tau}^2 = 0$, which could be argued is the logical thing that should happen. If the prediction interval should be computed exactly as described by Riley et al. (2001), one can use argument '' | + | Note that this differs slightly from Riley et al. (2011), who suggest to use a t-distribution with $k-2$ degrees of freedom for constructing the interval. Neither a normal, nor a t-distribution with $k-1$ or $k-2$ degrees of freedom is correct; all of these are approximations. The computations in metafor are done in the way described above, so that the prediction interval is identical to the confidence interval for $\mu$ when $\hat{\tau}^2 = 0$, which could be argued is the logical thing that should happen. If the prediction interval should be computed exactly as described by Riley et al. (2011), one can use argument '' |
??? How is the Freeman-Tukey transformation of proportions and incidence rates computed? | ??? How is the Freeman-Tukey transformation of proportions and incidence rates computed? | ||
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==== References ==== | ==== References ==== | ||
- | Freeman, M. F., & Tukey, J. W. (1950). Transformations related to the angular and the square root. //Annals of Mathematical Statistics, 21//(4), 607--611. | + | Freeman, M. F., & Tukey, J. W. (1950). Transformations related to the angular and the square root. //Annals of Mathematical Statistics, 21//(4), 607--611. |
- | Higgins, J. P. T., & Thompson, S. G. (2002). Quantifying heterogeneity in a meta-analysis. // | + | Higgins, J. P. T., & Thompson, S. G. (2002). Quantifying heterogeneity in a meta-analysis. // |
- | van Houwelingen, | + | van Houwelingen, |
Lipsey, M. W., & Wilson, D. B. (2001). //Practical meta-Analysis.// | Lipsey, M. W., & Wilson, D. B. (2001). //Practical meta-Analysis.// | ||
Raudenbush, S. W. (2009). Analyzing effect sizes: Random effects models. In H. Cooper, L. V. Hedges, & J. C. Valentine (Eds.), //The handbook of research synthesis and meta-analysis// | Raudenbush, S. W. (2009). Analyzing effect sizes: Random effects models. In H. Cooper, L. V. Hedges, & J. C. Valentine (Eds.), //The handbook of research synthesis and meta-analysis// | ||
+ | |||
+ | Riley, R. D., Higgins, J. P. T. & Deeks, J. J. (2011). Interpretation of random effects meta-analyses. //British Medical Journal, 342//, d549. https:// | ||
Sterne, J. A. C. (Ed.) (2009). // | Sterne, J. A. C. (Ed.) (2009). // | ||
faq.txt · Last modified: 2023/01/24 07:56 by Wolfgang Viechtbauer