# tbl_ard_continuous(cards)

    Code
      as.data.frame(tbl_ard_continuous(cards::ard_continuous(trial, by = grade,
        variables = age), variable = "age", include = "grade"))
    Output
        **Characteristic**        **N = NA**
      1              grade              <NA>
      2                  I 47.0 (37.0, 56.0)
      3                 II 48.5 (37.0, 57.0)
      4                III 47.0 (38.0, 58.0)

---

    Code
      as.data.frame(tbl_ard_continuous(cards::bind_ard(cards::ard_continuous(trial,
        by = c(trt, grade), variables = age), cards::ard_categorical(trial, trt)),
      variable = "age", include = "grade", by = "trt"))
    Output
        **Characteristic** **Drug A**  \nN = 98 **Drug B**  \nN = 102
      1              grade                 <NA>                  <NA>
      2                  I    46.0 (36.0, 60.0)     48.0 (42.0, 55.0)
      3                 II    44.5 (31.0, 55.0)     50.5 (42.0, 57.5)
      4                III    51.5 (41.5, 60.5)     45.0 (36.0, 52.0)

# tbl_ard_continuous(cards) error messaging

    Code
      tbl_ard_continuous(cards::bind_ard(cards::ard_continuous(trial, by = c(trt,
        grade), variables = age)), variable = "trt", include = "grade", by = "age")
    Condition
      Error in `tbl_ard_continuous()`:
      ! The continuous variable specified in argument `variable` must appear in the column `cards$variable`.

---

    Code
      tbl_ard_continuous(cards::bind_ard(cards::ard_continuous(trial, by = c(trt,
        grade), variables = age)), variable = "age", include = "trt", by = "grade")
    Condition
      Error in `tbl_ard_continuous()`:
      ! All variables specified in argument `include` must appear in the column `cards$group2`.

# tbl_ard_continuous(statistic) error messaging

    Code
      tbl_ard_continuous(cards::ard_continuous(trial, by = grade, variables = age),
      variable = "age", include = "grade", statistic = everything() ~ c("{mean}",
        "{median}"))
    Condition
      Error in `tbl_ard_continuous()`:
      ! Elements of the `statistic` argument must be strings.

