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#' Bayesian inverse variance weighted model with a choice of prior distributions fitted using RStan.
#'
#' Bayesian inverse variance weighted model with a choice of prior distributions fitted using RStan.
#'
#' @param data A data of class [`mr_format`].
#' @param prior An integer for selecting the prior distributions;
#'
#' * `1` selects a non-informative set of priors;
#' * `2` selects weakly informative priors;
#' * `3` selects a pseudo-horseshoe prior on the causal effect.
#' @param n.chains Numeric indicating the number of chains used in the HMC estimation in rstan, the default is `3` chains.
#' @param n.burn Numeric indicating the burn-in period of the Bayesian HMC estimation. The default is `1000` samples.
#' @param n.iter Numeric indicating the number of iterations in the Bayesian MCMC estimation. The default is `5000` iterations.
#' @param seed Numeric indicating the random number seed. The default is `12345`.
#' @param ... Additional arguments passed through to [`rstan::sampling()`].
#'
#' @return An object of class [`stanfit`].
#'
#' @references Burgess, S., Butterworth, A., Thompson S.G. Mendelian randomization analysis with multiple genetic variants using summarized data. Genetic Epidemiology, 2013, 37, 7, 658-665 \doi{10.1002/gepi.21758}.
#' @references Stan Development Team (2020). "RStan: the R interface to Stan." R package version 2.19.3, <https://mc-stan.org/>.
#'
#' @examples
#' if (requireNamespace("rstan", quietly = TRUE)) {
#' ivw_fit <- mr_ivw_stan(bmi_insulin)
#' print(ivw_fit)
#' rstan::traceplot(ivw_fit)
#' }
#' @export
mr_ivw_stan <- function(data,
prior = 1,
n.chains = 3,
n.burn = 1000,
n.iter = 5000,
seed = 12345,
...) {
# check for rstan
rstan_check()
# convert MRInput object to mr_format
if ("MRInput" %in% class(data)) {
data <- mrinput_mr_format(data)
}
# check class of object
if (!("mr_format" %in% class(data))) {
stop(
'The class of the data object must be "mr_format", please resave the object with the output of e.g. object <- mr_format(object).'
)
}
# converting dataset to a list
datam <- list(
n = nrow(data),
xbeta = data[, 2] / data[, 5],
ybeta = data[, 3] / data[, 5],
prior = prior
)
ivwfit <- rstan::sampling(
object = stanmodels$mrivw,
data = datam,
pars = c("estimate"),
chains = n.chains,
warmup = n.burn,
iter = n.iter,
seed = seed,
control = list(adapt_delta = 0.999, max_treedepth = 15),
...
)
return(ivwfit)
}
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