modified sort_ard_hierarchical function

[rikoprogrammer]

Propose to add the ability to sort an ard based on a particular treatment column

• Style this entry in a way that can be copied directly into NEWS.md. (Feature Request: sort_ard_hierarchical #548, @)

There was a need to sort hierarchical tables based on one of the treatment columns eg Placebo. The current function sorts by getting the sum across all the treatment columns. So I proposed if we can get an extra argument in the function that can be used for this purpose.

Close issue #548 .

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Optional Reverse Dependency Checks:

Install checked with pak::pak("Genentech/checked") or pak::pak("checked")

# Check dev versions of `cardx`, `gtsummary`, and `tfrmt` which are in the `ddsjoberg` R Universe
Rscript -e "options(checked.check_envvars = c(NOT_CRAN = TRUE)); checked::check_rev_deps(path = '.', n = parallel::detectCores() - 2L, repos = c('https://ddsjoberg.r-universe.dev', 'https://cloud.r-project.org'))"

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Rscript -e "options(checked.check_envvars = c(NOT_CRAN = FALSE), checked.check_build_args = '--as-cran'); checked::check_rev_deps(path = '.', n = parallel::detectCores() - 2, repos = 'https://cloud.r-project.org')"

[github-actions]

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[rikoprogrammer]

I have read the CLA Document and I hereby sign the CLA

[ddsjoberg]

@rikoprogrammer thanks for the PR. Can you address the CI/CD failures, please? The contributing guide often guides us to the resolution. https://github.com/insightsengineering/cards/blob/main/.github/CONTRIBUTING.md

Thanks!

[rikoprogrammer]

Okay, I will check it out. Thanks

…

On Mon, Apr 27, 2026 at 10:59 PM Daniel Sjoberg ***@***.***> wrote: *ddsjoberg* left a comment (insightsengineering/cards#550) <#550 (comment)> @rikoprogrammer <https://github.com/rikoprogrammer> thanks for the PR. Can you address the CI/CD failures, please? The contributing guide often guides us to the resolution. https://github.com/insightsengineering/cards/blob/main/.github/CONTRIBUTING.md Thanks! — Reply to this email directly, view it on GitHub <#550 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/APU7EE2QVWIMCJV36SM4SI34X63YTAVCNFSM6AAAAACX36MNZGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DGMZQGAZTQNZYHA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

[Melkiades]

we need to add this to .gitignore

[Melkiades]

(the file)

[ddsjoberg]

oh my goodness! can you add, please? I am surprised it wasn't already there! 😱

[rikoprogrammer]

Hello, How do I correct these Latex related errors. They don't show up in my local R session, so its a bit difficult for me to catch them. Thanks

[ddsjoberg]

after the argument name, we put the expected type of input. maybe that is causing your latex issue

[rikoprogrammer]

okay,thanks for the hint.

[ddsjoberg]

Code Review

1. Committed .Rhistory file

The .Rhistory file (181 lines of interactive R session history) is committed to the repository. This file contains local filesystem paths (D:/ARDs/cards), Sys.getenv() calls, and development workflow noise. It must be removed from the PR.

While .Rhistory was added to .gitignore in this PR, that only prevents future tracking — the file is already staged and will be part of the repo. Run:

git rm --cached .Rhistory

2. Correctness: stat column mutation is destructive

This is the most significant issue. The core logic (lines 291–300 of the diff) mutates the stat column in-place, zeroing out stats for non-matching treatment arms:

if (!is.null(sort_col)) {
  x <- x |>
    dplyr::mutate(stat = dplyr::case_when(
      stat_name == sort_stat & variable == dplyr::last(ard_args$variables) & group1_level == sort_col ~ stat,
      stat_name == sort_stat & variable == dplyr::last(ard_args$variables) & group1_level != sort_col ~ list(0),
      TRUE ~ stat
    ))
}

Problems:

• Destroys data: The modified x with zeroed-out stats flows into x_sums computation and then is returned via x |> dplyr::left_join(x_sums, ...) at the end of .append_hierarchy_sums(). The caller in sort_ard_hierarchical() assigns this back to x_sort, which carries the corrupted stat values. While the final output uses x[idx_sorted, ] (the original x), this only works because x_sort is used solely for index extraction. This is fragile — any future refactor that uses x_sort values directly would silently produce wrong results.

• Only filters on dplyr::last(ard_args$variables): The zeroing only applies to the innermost variable. For outer hierarchy levels (e.g., AESOC when variables are c(AESOC, AEDECOD)), the sort_col filtering has no effect — sums are still computed across all treatment arms. This means the feature only partially works for multi-level hierarchies.

• Hardcodes group1_level: The comparison group1_level == sort_col assumes the treatment/by variable is always in group1_level. This breaks when there are multiple by variables or when the ARD structure places the treatment column elsewhere.

Suggested approach: Instead of mutating stat, filter the rows used for sum computation. The x_sums pipeline already has a dplyr::filter(...) step — add the sort_col filter there:

x_sums <- x |>
  dplyr::filter(
    .data$stat_name == sort_stat,
    if (!is.null(sort_col)) .data$group1_level == sort_col else TRUE,
    # ... existing filters ...
  )

This avoids mutating x entirely and is both simpler and safer.

3. No input validation for sort_col

There is no validation that sort_col:

• Is a single string (not a vector)
• Actually exists as a level in the by variable of the ARD
• Is only used when sort includes "descending" (it has no meaning with "alphanumeric")

Passing a non-existent treatment name would silently zero out all stats and produce an arbitrary sort order with no error or warning. Add a check_string() call and validate that the value exists in the ARD's group levels.

4. No unit tests for sort_col

The PR adds no tests for the new sort_col parameter. The existing test file (test-sort_ard_hierarchical.R) has thorough coverage for sort but nothing for sort_col. At minimum, tests should cover:

• Basic sort_col usage with a valid treatment arm name
• sort_col with a non-existent treatment name (should error)
• sort_col with multi-level hierarchies (verify all levels sort correctly)
• sort_col combined with mixed sort types (sort = list(VAR1 ~ "alphanumeric", VAR2 ~ "descending"))

5. Default argument sort_col = sort_col in internal function

.append_hierarchy_sums <- function(x, ard_args, cols, i, sort_col = sort_col) {

The default sort_col = sort_col is a self-referencing default that relies on R's lazy evaluation to resolve sort_col from the calling scope. While this works in R, it's confusing and fragile. Use sort_col = NULL instead, which matches the public API's default and is explicit.

6. else { x <- x } is a no-op

} else {
  x <- x
}

This branch does nothing. Remove it.

7. Documentation

• The @param sort_col description has a typo: "leave it blank if you to sort" → "leave it blank if you want to sort".
• The parameter name sort_col is misleading — it's not a column name, it's a level value within the by column. A name like sort_by_level or by_level would be clearer. The current name suggests you're specifying which column to sort by, not which treatment arm level to use for sorting.
• The description says "treatment column" but the feature applies to any by variable, not just treatment.

8. .gitignore changes

Adding .Rhistory, .RData, .Ruserdata to .gitignore is a good improvement, but it should be a separate commit or PR since it's unrelated to the sort_col feature. The trailing newline addition is fine.

Summary

The feature addresses a real need (issue #548), but the implementation has correctness concerns around destructive mutation of the stat column and incomplete handling of multi-level hierarchies. The PR also needs the .Rhistory file removed, input validation added, and unit tests written before it's ready for merge.

[rikoprogrammer]

Thanks for the comments @ddsjoberg
I will check this in due course.