print.check_outliers() mislabels thresholds when method is a combination given in non-canonical order

The bug is in the print method in R/check_outliers.R. Look at the data.frame construction where method and thresholds are combined; the order of thresholds from attr(x, 'threshold') does not match the user's method order. Start by reading the function print.check_outliers, then trace how thresholds are stored. Run the reproducible example to confirm the mismatch, and ensure the printed summary pairs each method with its correct threshold.

When check_outliers() is run with a single method (e.g. "mcd"), the printed threshold is correct. When run combining several methods (e.g. c("mcd", "lof", "iqr"), the printed summary line pairs each method name with the wrong threshold value if the user's method order differs from the package's internal default order.

Each method correctly uses its own threshold internally, but there seems to be a display bug in the printed message.

Reproducible example:

library(performance)

data(mtcars)

# With a single methods, it works ok
check_outliers(mtcars, method = "mcd")
#> Based on the following method and threshold: mcd (31.264)

# Combined methods — mislabeled
check_outliers(mtcars, method = c("mcd", "lof", "iqr"))
#>  Based on the following methods and thresholds: mcd (2), lof (31.264), iqr (0.001)

I suspect that the root cause may be in print.check_outliers() (R/check_outliers.R):

thresholds <- lapply(attr(x, "threshold"), round_to_last_digit, 3)
method.thresholds <- data.frame(
  method = method,                 # this keeps the order given by the user 
  thresholds = unlist(thresholds)  # this keeps the order given by the package
)

Let me know if I can help with this!

sessionInfo()
R version 4.5.0 (2025-04-11 ucrt)
Platform: x86_64-w64-mingw32/x64
Running under: Windows 10 x64 (build 19045)

Matrix products: default
LAPACK version 3.12.1

locale:
[1] LC_COLLATE=Spanish_Argentina.utf8
[2] LC_CTYPE=Spanish_Argentina.utf8
[3] LC_MONETARY=Spanish_Argentina.utf8
[4] LC_NUMERIC=C
[5] LC_TIME=Spanish_Argentina.utf8

time zone: America/Buenos_Aires
tzcode source: internal

attached base packages:
[1] stats graphics grDevices datasets utils methods
[7] base

other attached packages:
[1] performance_0.18.2

loaded via a namespace (and not attached):
[1] jsonlite_2.0.0 dplyr_1.2.0 compiler_4.5.0
[4] renv_1.0.11 Rcpp_1.1.1 tidyselect_1.2.1
[7] tidyr_1.3.2 DiagrammeR_1.0.12 yaml_2.3.10
[10] fastmap_1.2.0 dbscan_1.2.6 R6_2.6.1
[13] generics_0.1.4 igraph_2.3.2 knitr_1.50
[16] htmlwidgets_1.6.4 MASS_7.3-65 visNetwork_2.1.4
[19] backports_1.5.0 tibble_3.3.1 insight_1.5.4
[22] pillar_1.11.1 RColorBrewer_1.1-3 rlang_1.1.7
[25] cachem_1.1.0 xfun_0.55 datawizard_1.4.0
[28] memoise_2.0.1 cli_3.6.5 magrittr_2.0.4
[31] digest_0.6.37 rstudioapi_0.17.1 lifecycle_1.0.5
[34] vctrs_0.7.1 dm_1.1.2 evaluate_1.0.3
[37] glue_1.8.0 rmarkdown_2.29 purrr_1.2.1
[40] tools_4.5.0 pkgconfig_2.0.3 htmltools_0.5.8.1