Do not coerce to factor in `tbl_svysummary()` about gtsummary HOT 8 OPEN

Because the default (t.test) is not implemented for tbl_svysummary(). You should use "smd", cf. https://www.danieldsjoberg.com/gtsummary/reference/tests.html#tbl-svysummary-add-difference-

Currently, add_difference() does not change the default tests when applied to a tbl_svysummary()

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I was thinking more about the tbl_svysummary() table itself. The unobserved columns appear in the table, even if we make the underlying column character.

library(gtsummary)
library(PNSIBGE)

pns <- get_pns(year = 2019, labels = TRUE)
pns.2 <- subset(pns, C009  %in% c("Branca", "Preta")) 
pns.2$variables$C009 <- as.character(pns.2$variables$C009)

pns.2 |> 
  gtsummary::tbl_svysummary(by = C009, include = c(C006)) |> 
  gtsummary::as_kable()

But I just tried to tabulate directly with the survey package, and it still shows all levels, even when the column has previously been converted to a character.

So what they are dealing with is a non-standard situation, and they'd just need to write their own method in add_stat() for this, and hide the unobserved columns themselves.

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Probably because somewhere the levels are still declared. pns.2$variables$C009 <- as.character(pns.2$variables$C009) did not change metadata stored within the survey object.

It is much safier to use fct_drop() through srvyr::mutate()

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But a question remains open: if this is a tbl_svysummary table, should we apply, by default, a relevant test?

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Even dropping the levels with srvry, the unobserved levels appear from the survey function.

pns.2 <- 
  srvyr::as_survey_design(pns) |> 
  srvyr::filter(C009 %in% c("Branca", "Preta")) |> 
  srvyr::mutate(C009 = as.character(C009))

survey::svytable(~C009,pns.2)
#> C009
#>  Amarela   Branca Ignorado Indígena    Parda    Preta 
#>        0 91037722        0        0        0 21786515 

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But, yes, I better default is warrented!

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If I remember, as.character keeps the levels attributes, while forcats::fct_drop() remove unobserved levels.

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Same issue with forcats::fct_drop() unfortunately

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