The Pearson chi-squared and likelihood ratio tests for unspecific ordering in rx2 tables — Pearson_LR_tests_unspecific_ordering

The Pearson chi-squared and likelihood ratio tests for unspecific ordering in rx2 tables. Described in Chapter 5 "The Ordered rx2 Table". May also be used for 2xc tables, after flipping rows and columns (i.e. if n is a 2xc table, call this function with n' (the transpose of n) as the first argument).

Pearson_LR_tests_unspecific_ordering_rx2(n, direction)

Arguments

n: the observed counts (an rx2 matrix)
direction: the direction of the success probabilities ("increasing" or "decreasing")

Value

An object of the contingencytables_result class, basically a subclass of base::list(). Use the utils::str() function to see the specific elements returned.

Examples

# Chapter 5: Alcohol consumption and malformations (Mills and Graubard, 1987)
Pearson_LR_tests_unspecific_ordering_rx2(mills_graubard_1987, "increasing")
#> Pearson chi-squared test: T = 11.988, P = 0.00171
#> Likelihood ratio test:    T =  6.103, P = 0.02990

# Chapter 5: Elevated troponin T levels in stroke patients (Indredavik et al., 2008)
Pearson_LR_tests_unspecific_ordering_rx2(indredavik_2008, "decreasing")
#> Pearson chi-squared test: T =  9.509, P = 0.00571
#> Likelihood ratio test:    T = 11.192, P = 0.00252

# Chapter 6: Postoperative nausea (Lydersen et al., 2012a)
Pearson_LR_tests_unspecific_ordering_rx2(t(lydersen_2012a), "decreasing")
#> Pearson chi-squared test: T =  3.724, P = 0.07564
#> Likelihood ratio test:    T =  3.813, P = 0.07222