@type groups() :: [number_list()]

@type number_list() :: [number()]

@type one_way_result() :: %{
  summary: %{
    groups: pos_integer(),
    group_sizes: [pos_integer()],
    total_observations: pos_integer(),
    overall_mean: float(),
    group_means: [float()]
  },
  anova_table: %{
    between: %{ss: float(), df: float(), ms: float()},
    within: %{ss: float(), df: float(), ms: float()},
    total: %{ss: float(), df: float()}
  },
  test_results: %{
    f_statistic: float(),
    p_value: float(),
    eta_squared: float(),
    omega_squared: float()
  }
}