how to know which variables are available to subset by in a multi_epidist object?

[avallecam]

From the examples, we can filter by sample_size (code 1). In a multi_epidist object from epidist_db() of two elements (code 2), I tried to apply that filter but object 'sample_size' not found (code 3).

Is there a way to see what variables are available for a multi_epidist object?

# code 1

epiparameter::epidist_db(
  disease = "SARS",
  epi_dist = "offspring_distribution",
  subset = sample_size > 40
)
#> Returning 1 results that match the criteria (1 are parameterised). 
#> Use subset to filter by entry variables or single_epidist to return a single entry. 
#> To retrieve the short citation for each use the 'get_citation' function
#> Disease: SARS
#> Pathogen: SARS-Cov-1
#> Epi Distribution: offspring distribution
#> Study: Lloyd-Smith J, Schreiber S, Kopp P, Getz W (2005). "Superspreading and
#> the effect of individual variation on disease emergence." _Nature_.
#> doi:10.1038/nature04153 <https://doi.org/10.1038/nature04153>.
#> Distribution: nbinom
#> Parameters:
#>   mean: 1.630
#>   dispersion: 0.160

# code 2

epiparameter::epidist_db(
  disease = "covid",
  epi_dist = "incubation",
  author = "McAloon"
)
#> Returning 2 results that match the criteria (2 are parameterised). 
#> Use subset to filter by entry variables or single_epidist to return a single entry. 
#> To retrieve the short citation for each use the 'get_citation' function
#> [[1]]
#> Disease: COVID-19
#> Pathogen: SARS-CoV-2
#> Epi Distribution: incubation period
#> Study: McAloon C, Collins Á, Hunt K, Barber A, Byrne A, Butler F, Casey M,
#> Griffin J, Lane E, McEvoy D, Wall P, Green M, O'Grady L, More S (2020).
#> "Incubation period of COVID-19: a rapid systematic review and
#> meta-analysis of observational research." _BMJ Open_.
#> doi:10.1136/bmjopen-2020-039652
#> <https://doi.org/10.1136/bmjopen-2020-039652>.
#> Distribution: lnorm
#> Parameters:
#>   meanlog: 1.660
#>   sdlog: 0.480
#> 
#> [[2]]
#> Disease: COVID-19
#> Pathogen: SARS-CoV-2
#> Epi Distribution: incubation period
#> Study: McAloon C, Collins Á, Hunt K, Barber A, Byrne A, Butler F, Casey M,
#> Griffin J, Lane E, McEvoy D, Wall P, Green M, O'Grady L, More S (2020).
#> "Incubation period of COVID-19: a rapid systematic review and
#> meta-analysis of observational research." _BMJ Open_.
#> doi:10.1136/bmjopen-2020-039652
#> <https://doi.org/10.1136/bmjopen-2020-039652>.
#> Distribution: lnorm
#> Parameters:
#>   meanlog: 1.630
#>   sdlog: 0.500
#> 
#> attr(,"class")
#> [1] "multi_epidist"

# code 3

epiparameter::epidist_db(
  disease = "covid",
  epi_dist = "incubation",
  author = "McAloon",
  subset = sample_size > 10
)
#> Error in epiparameter::epidist_db(disease = "covid", epi_dist = "incubation", : object 'sample_size' not found

^{Created on 2023-11-30 with reprex v2.0.2}

[joshwlambert]

This seems to be a bug. I've converted to issue #224 and will follow-up there. Thanks for raising.