#' @details The `sample_size` argument is optional, but when specified:
#'
#' * Enables automatic centering of predictors (`center = TRUE`) in [nma()]
#' when a regression model is given for a network combining IPD and AgD
#' * Enables production of study-specific relative effects, rank probabilities,
#' etc. for studies in the network when a regression model is given
#' * Nodes in [plot.nma_data()] may be weighted by sample size
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