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Adjusting Decimal Precision in Displayed Data

Source: vignettes/customize-digits.Rmd
customize-digits.Rmd

The interactive AE forest plots include AE-specific tables. In this vignette, we guide users on how to customize the number of decimal places displayed in the tables.

Step 1: build your metadata

Building interactive AE forest plots starts with constructing the metadata. The detailed procedure for building metadata is covered in the vignette Generate Interactive AE Forest Plots with Drill Down to AE Listing. Therefore, in this vignette, we will skip those details and directly use the metadata created there.

adsl <- forestly_adsl
adae <- forestly_adae

adsl$TRTA <- factor(forestly_adsl$TRT01A, 
                    levels = c("Xanomeline Low Dose", "Placebo"), 
                    labels = c("Low Dose", "Placebo"))
adae$TRTA <- factor(forestly_adae$TRTA, 
                    levels = c("Xanomeline Low Dose", "Placebo"), 
                    labels = c("Low Dose", "Placebo"))

meta <- meta_adam(population = adsl, observation = adae) |>
  define_plan(plan = plan(analysis = "ae_forestly", 
                          population = "apat",
                          observation = "apat", 
                          parameter = "any;drug-related")) |>
  define_analysis(name = "ae_forestly", label = "Interactive Forest Plot") |>
  define_population(name = "apat", group = "TRTA", id = "USUBJID",
                    subset = SAFFL == "Y", label = "All Patient as Treated") |>
  define_observation(name = "apat", group = "TRTA", 
                     subset = SAFFL == "Y", label = "All Patient as Treated") |>
  define_parameter(name = "any", 
                   subset = NULL,
                   label = "Any AEs", 
                   var = "AEDECOD", soc = "AEBODSYS") |>
  define_parameter(name = "drug-related", 
                   subset = toupper(AREL) == "RELATED",
                   label = "Drug-related AEs", 
                   var = "AEDECOD", soc = "AEBODSYS") |>  
  meta_build()

Step 2: customize the decimals

Users can adjust the decimal precision by specifying the digits = ... argument within the format_ae_forestly() function. By default, digits = 1 is set, displaying values with one decimal place. In the example below, we demonstrate how to increase this to two decimal places.

meta |>
  prepare_ae_forestly() |>
  format_ae_forestly(digits = 2) |>
  ae_forestly()