es_from_2x2_sum function

Convert a table with the number of cases and row marginal sums into several effect size measures

es_from_2x2_sum(
  n_cases_exp,
  n_exp,
  n_cases_nexp,
  n_nexp,
  table_2x2_to_cor = "tetrachoric",
  reverse_2x2
)

Arguments

• n_cases_exp: number of cases/events in the exposed group
• n_exp: total number of participants in the exposed group
• n_cases_nexp: number of cases/events in the non exposed group
• n_nexp: total number of participants in the non exposed group
• table_2x2_to_cor: formula used to obtain a correlation coefficient from the contigency table (see details).
• reverse_2x2: a logical value indicating whether the direction of generated effect sizes should be flipped.

Returns

This function estimates and converts between several effect size measures.

natural effect size measure	OR + RR + NNT
converted effect size measure	D + G + R + Z
required input data	See 'Section 7. Contingency (2x2) table or proportions'
	https://metaconvert.org/input.html

Details

This function uses the number of cases in both the exposed and non-exposed groups and the total number of participants exposed and non-exposed to recreate a 2x2 table. Then relies on the calculations of the es_from_2x2 function.

$$n\_controls\_exp = n\_exp - n\_cases\_exp$$ $$n\_controls\_nexp = n\_nexp - n\_cases\_nexp$$

Examples

es_from_2x2_sum(n_cases_exp = 10, n_exp = 40, n_cases_nexp = 25, n_nexp = 47)