graph_rejection_orderings {graphicalMCP}

Find alternate rejection orderings (sequences) for shortcut tests

Description

When multiple hypotheses are rejected by using graph_test_shortcut(), there may be multiple orderings or sequences in which hypotheses are rejected one by one. The default order in graph_test_shortcut() is based on the adjusted p-values, from the smallest to the largest. This function graph_rejection_orderings() provides all possible and valid orders (or sequences) of rejections. Although the order of rejection does not affect the final rejection decisions Bretz et al. (2009), different sequences could offer different ways to explain the step-by-step process of shortcut graphical multiple comparison procedures.

Usage

graph_rejection_orderings(shortcut_test_result)

Arguments

shortcut_test_result

A graph_report object as returned by graph_test_shortcut().

Value

A modified graph_report object containing all valid orderings of rejections of hypotheses

References

Bretz, F., Maurer, W., Brannath, W., and Posch, M. (2009). A graphical approach to sequentially rejective multiple test procedures. Statistics in Medicine, 28(4), 586-604.

Bretz, F., Posch, M., Glimm, E., Klinglmueller, F., Maurer, W., and Rohmeyer, K. (2011). Graphical approaches for multiple comparison procedures using weighted Bonferroni, Simes, or parametric tests. Biometrical Journal, 53(6), 894-913.

See Also

graph_test_shortcut() for shortcut graphical multiple comparison procedures.

Examples

# A graphical multiple comparison procedure with two primary hypotheses (H1
# and H2) and two secondary hypotheses (H3 and H4)
# See Figure 4 in Bretz et al. (2011).
hypotheses <- c(0.5, 0.5, 0, 0)
delta <- 0.5
transitions <- rbind(
  c(0, delta, 1 - delta, 0),
  c(delta, 0, 0, 1 - delta),
  c(0, 1, 0, 0),
  c(1, 0, 0, 0)
)
g <- graph_create(hypotheses, transitions)

p <- c(0.018, 0.01, 0.105, 0.006)
alpha <- 0.025

shortcut_testing <- graph_test_shortcut(g, p, alpha, verbose = TRUE)

# Reject H1, H2, and H4
shortcut_testing$outputs$rejected

# Default order of rejections: H2, H1, H4
shortcut_testing$details$del_seq

# There is another valid sequence of rejection: H2, H4, H1
graph_rejection_orderings(shortcut_testing)$valid_orderings

# Finally, intermediate updated graphs can be obtained by providing the order
# of rejections into `[graph_update()]`
graph_update(g, delete = c(2, 4, 1))