Get Parameter Dimensions of the dynamite Model

Extracts the names and dimensions of all parameters used in the dynamite model. See also get_parameter_types() and get_parameter_names(). The returned dimensions match those of the stanfit element of the dynamitefit object. When applied to dynamiteformula objects, the model is compiled and sampled for 1 iteration to get the parameter dimensions.

Usage

get_parameter_dims(x, ...)

# S3 method for class 'dynamiteformula'
get_parameter_dims(x, data, time, group = NULL, ...)

# S3 method for class 'dynamitefit'
get_parameter_dims(x, ...)

Arguments

x

[dynamiteformula or dynamitefit]
The model formula or an existing dynamitefit object. See dynamiteformula() and dynamite().

...

Ignored.

data

[data.frame, tibble::tibble, or data.table::data.table]
The data that contains the variables in the model in long format. Supported column types are integer, logical, double, and factor. Columns of type character will be converted to factors. Unused factor levels will be dropped. The data can contain missing values which will simply be ignored in the estimation in a case-wise fashion (per time-point and per channel). Input data is converted to channel specific matrix representations via stats::model.matrix.lm().

time

[character(1)]
A column name of data that denotes the time index of observations. If this variable is a factor, the integer representation of its levels are used internally for defining the time indexing.

group

[character(1)]
A column name of data that denotes the unique groups or NULL corresponding to a scenario without any groups. If group is NULL, a new column .group is created with constant value 1L is created indicating that all observations belong to the same group. In case of name conflicts with data, see the group_var element of the return object to get the column name of the new variable.

Value

A named list with all parameter dimensions of the input model.

See also

Model outputs as.data.frame.dynamitefit(), as.data.table.dynamitefit(), as_draws_df.dynamitefit(), coef.dynamitefit(), confint.dynamitefit(), dynamite(), get_code(), get_data(), get_parameter_names(), get_parameter_types(), ndraws.dynamitefit(), nobs.dynamitefit()

Examples

data.table::setDTthreads(1) # For CRAN
get_parameter_dims(multichannel_example_fit)
#> $beta_g
#> [1] 2
#> 
#> $a_g
#> [1] 1
#> 
#> $sigma_g
#> [1] 1
#> 
#> $beta_p
#> [1] 3
#> 
#> $a_p
#> [1] 1
#> 
#> $beta_b
#> [1] 5
#> 
#> $a_b
#> [1] 1
#>