posteriordraws() is an alias to posterior_draws()This alias is kept for backward compatibility and because some users may prefer that name.
posteriordraws(x, shape = "long")A data.frame with drawid and draw columns.
An object produced by a marginaleffects package function, such as predictions(), avg_slopes(), hypotheses(), etc.
string indicating the shape of the output format:
"long": long format data frame
"DxP": Matrix with draws as rows and parameters as columns
"PxD": Matrix with draws as rows and parameters as columns
"rvar": Random variable datatype (see posterior package documentation).