Extract parameters from a single draw

Extract parameters from a single draw

Usage

extract_parameters_from_draw(fit, param, draw)

Arguments

fit

Stanfit object.

param

Vector of parameter names.

draw

Index of the draw to extract the parameters from.

Value

Dataframe

Note

Useful for to generate fake data.

Alternative

The 'tidybayes' package offers an alternative to this function, for example:

fit %>% tidy_draws() %>% gather_variables() %>% filter(.draw == draw & .variable %in% param)

However, the 'tidybayes' version is less efficient as all draws and parameters are extracted and then filtered (also the draw IDs are not the same). Using 'tidybayes' would be more recommended when we only want to extract specific parameters, and that it does not matter which draw are extracted (in that case using tidybayes::spread_draws()).