ard_ttest.md
In cardx: Extra Analysis Results Data Utilities

ard_ttest() works

Code
  as.data.frame(ard_ttest(cards::ADSL, by = ARM, variable = AGE, var.equal = TRUE))
Output
     group1 variable context   stat_name          stat_label  stat fmt_fn warning
  1     ARM      AGE   ttest    estimate     Mean Difference  NULL   NULL    NULL
  2     ARM      AGE   ttest   estimate1        Group 1 Mean  NULL   NULL    NULL
  3     ARM      AGE   ttest   estimate2        Group 2 Mean  NULL   NULL    NULL
  4     ARM      AGE   ttest   statistic         t Statistic  NULL   NULL    NULL
  5     ARM      AGE   ttest     p.value             p-value  NULL   NULL    NULL
  6     ARM      AGE   ttest   parameter  Degrees of Freedom  NULL   NULL    NULL
  7     ARM      AGE   ttest    conf.low      CI Lower Bound  NULL   NULL    NULL
  8     ARM      AGE   ttest   conf.high      CI Upper Bound  NULL   NULL    NULL
  9     ARM      AGE   ttest      method              method  NULL   NULL    NULL
  10    ARM      AGE   ttest alternative         alternative  NULL   NULL    NULL
  11    ARM      AGE   ttest          mu             H0 Mean  NULL   NULL    NULL
  12    ARM      AGE   ttest      paired       Paired t-test FALSE   NULL    NULL
  13    ARM      AGE   ttest   var.equal     Equal Variances  TRUE   NULL    NULL
  14    ARM      AGE   ttest  conf.level CI Confidence Level  NULL   NULL    NULL
                                          error
  1  grouping factor must have exactly 2 levels
  2  grouping factor must have exactly 2 levels
  3  grouping factor must have exactly 2 levels
  4  grouping factor must have exactly 2 levels
  5  grouping factor must have exactly 2 levels
  6  grouping factor must have exactly 2 levels
  7  grouping factor must have exactly 2 levels
  8  grouping factor must have exactly 2 levels
  9  grouping factor must have exactly 2 levels
  10 grouping factor must have exactly 2 levels
  11 grouping factor must have exactly 2 levels
  12 grouping factor must have exactly 2 levels
  13 grouping factor must have exactly 2 levels
  14 grouping factor must have exactly 2 levels

ard_paired_ttest() works

Code
  as.data.frame(ard_paired_ttest(dplyr::mutate(ADSL_paired, ARM = ifelse(dplyr::row_number() ==
    1L, "3rd ARM", ARM)), by = ARM, variable = AGE, id = USUBJID, var.equal = TRUE))
Output
     group1 variable context   stat_name          stat_label stat fmt_fn warning
  1     ARM      AGE   ttest    estimate     Mean Difference NULL   NULL    NULL
  2     ARM      AGE   ttest   estimate1        Group 1 Mean NULL   NULL    NULL
  3     ARM      AGE   ttest   estimate2        Group 2 Mean NULL   NULL    NULL
  4     ARM      AGE   ttest   statistic         t Statistic NULL   NULL    NULL
  5     ARM      AGE   ttest     p.value             p-value NULL   NULL    NULL
  6     ARM      AGE   ttest   parameter  Degrees of Freedom NULL   NULL    NULL
  7     ARM      AGE   ttest    conf.low      CI Lower Bound NULL   NULL    NULL
  8     ARM      AGE   ttest   conf.high      CI Upper Bound NULL   NULL    NULL
  9     ARM      AGE   ttest      method              method NULL   NULL    NULL
  10    ARM      AGE   ttest alternative         alternative NULL   NULL    NULL
  11    ARM      AGE   ttest          mu             H0 Mean NULL   NULL    NULL
  12    ARM      AGE   ttest      paired       Paired t-test TRUE   NULL    NULL
  13    ARM      AGE   ttest   var.equal     Equal Variances TRUE   NULL    NULL
  14    ARM      AGE   ttest  conf.level CI Confidence Level NULL   NULL    NULL
                                                    error
  1  The `by` argument must have two and only two levels.
  2  The `by` argument must have two and only two levels.
  3  The `by` argument must have two and only two levels.
  4  The `by` argument must have two and only two levels.
  5  The `by` argument must have two and only two levels.
  6  The `by` argument must have two and only two levels.
  7  The `by` argument must have two and only two levels.
  8  The `by` argument must have two and only two levels.
  9  The `by` argument must have two and only two levels.
  10 The `by` argument must have two and only two levels.
  11 The `by` argument must have two and only two levels.
  12 The `by` argument must have two and only two levels.
  13 The `by` argument must have two and only two levels.
  14 The `by` argument must have two and only two levels.