es_from_or: Convert an odds ratio value to several effect size measures

In metaConvert: An Automatic Suite for Estimation of Various Effect Size Measures

Convert an odds ratio value to several effect size measures

Description

Convert an odds ratio value to several effect size measures

Usage

es_from_or(
  or,
  logor,
  n_cases,
  n_controls,
  n_sample,
  small_margin_prop,
  baseline_risk,
  n_exp,
  n_nexp,
  or_to_cor = "bonett",
  or_to_rr = "metaumbrella_cases",
  reverse_or
)

Arguments

or	odds ratio value
logor	log odds ratio value
n_cases	number of cases/events
n_controls	number of controls/no-event
n_sample	total number of participants in the sample
small_margin_prop	smallest margin proportion of the underlying 2x2 table
baseline_risk	proportion of cases in the non-exposed group
n_exp	number of participants in the exposed group
n_nexp	number of participants in the non-exposed group
or_to_cor	formula used to convert the or value into a correlation coefficient (see details).
or_to_rr	formula used to convert the or value into a risk ratio (see details).
reverse_or	a logical value indicating whether the direction of the generated effect sizes should be flipped.

Details

This function computes the standard error of the log odds ratio. Risk ratio (RR), Cohen's d (D), Hedges' g (G) and correlation coefficients (R/Z), are converted from the odds ratio value.

Estimation of the standard error of the log OR. This function generates the standard error of an odds ratio (OR) based on the OR value and the number of cases and controls. More precisely, this function simulates all combinations of the possible number of cases and controls in the exposed and non-exposed groups compatible with the reported OR value and with the overall number of cases and controls. Then, our function assumes that the variance of the OR is equal to the mean of the standard error of all possible situations. This estimation thus necessarily comes with some imprecision and should not be used before having requested the value (or raw data) to authors of the original report.

Conversion of other effect size measures. Calculations of es_from_or_se() are then applied to estimate the other effect size measures

Value

This function estimates and converts between several effect size measures.

natural effect size measure	N/A
converted effect size measure	OR + RR + NNT
	D + G + R + Z
required input data	See 'Section 2. Odds Ratio'
	https://metaconvert.org/input.html

References

Gosling, C. J., Solanes, A., Fusar-Poli, P., & Radua, J. (2023). metaumbrella: the first comprehensive suite to perform data analysis in umbrella reviews with stratification of the evidence. BMJ mental health, 26(1), e300534. https://doi.org/10.1136/bmjment-2022-300534

Examples

es_or_guess <- es_from_or(or = 0.5, n_cases = 210, n_controls = 220)
es_or <- es_from_or_se(or = 0.5, logor_se = 0.4, n_cases = 210, n_controls = 220)
round(es_or_guess$logor_se, 0.10) == round(es_or$logor_se, 0.10)

metaConvert documentation built on April 12, 2025, 1:09 a.m.