Computes the reference standard deviation of the given meta-analysis data set. The reference standard deviation is defined as the geometric mean of the standard deviations of the individual studies (Sorbye & Rue 2014, equation (7)).
data frame with one column "sigma" containing the standard errors of the estimates for the individual studies.
The reference standard deviation of the data set. Non-negative real number.
Sorbye, S., Rue, H. (2014). Scaling intrinsic Gaussian Markov random field priors in spatial modelling. Spatial Statistics 8, 39–51. doi: 10.1016/j.spasta.2013.06.004
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