es_from_rr_ci: Convert a risk ratio value and 95% confidence interval to...

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

Convert a risk ratio value and 95% confidence interval to various effect size measures

Description

Convert a risk ratio value and 95% confidence interval to various effect size measures

Usage

es_from_rr_ci(
  rr,
  rr_ci_lo,
  rr_ci_up,
  logrr,
  logrr_ci_lo,
  logrr_ci_up,
  baseline_risk,
  n_exp,
  n_nexp,
  n_cases,
  n_controls,
  rr_to_or = "metaumbrella",
  smd_to_cor = "viechtbauer",
  max_asymmetry = 10,
  reverse_rr
)

Arguments

rr	risk ratio value
rr_ci_lo	lower bound of the 95% CI around the risk ratio value
rr_ci_up	upper bound of the 95% CI around the risk ratio value
logrr	log risk ratio value
logrr_ci_lo	lower bound of the 95% CI around the log risk ratio value
logrr_ci_up	upper bound of the 95% CI around the log risk ratio value
baseline_risk	proportion of cases in the non-exposed group (only required for the rr_to_or = "grant_CI" and rr_to_or = "grant_2x2" arguments).
n_exp	number of participants in the exposed group (only required for the rr_to_or = "grant_CI", rr_to_or = "grant_2x2" arguments).
n_nexp	number of participants in the non-exposed group (only required for the rr_to_or = "grant_CI", rr_to_or = "grant_2x2" arguments).
n_cases	number of cases/events
n_controls	number of controls/no-event
rr_to_or	formula used to convert the rr value into an odds ratio (see details).
smd_to_cor	formula used to convert the SMD value (converted from RR) into a coefficient correlation (see es_from_cohen_d).
max_asymmetry	A percentage indicating the tolerance before detecting asymmetry in the 95% CI bounds.
reverse_rr	a logical value indicating whether the direction of the generated effect sizes should be flipped.

Details

This function uses the 95% CI of the (log) risk ratio to obtain the standard error (Section 6.5.2.2 in the Cochrane Handbook).

logrr\_se = \frac{\log{rr\_ci\_up} - \log{rr\_ci\_lo}}{2 * qnorm(.975)}

Then, calculations of the es_from_rr_se() are applied.

Value

This function estimates and converts between several effect size measures.

natural effect size measure	RR
converted effect size measure	OR + NNT
required input data	See 'Section 3. Risk Ratio'
	https://metaconvert.org/input.html

References

Higgins JPT, Li T, Deeks JJ (editors). Chapter 6: Choosing effect size measures and computing estimates of effect. In: Higgins JPT, Thomas J, Chandler J, Cumpston M, Li T, Page MJ, Welch VA (editors). Cochrane Handbook for Systematic Reviews of Interventions version 6.3 (updated February 2022). Cochrane, 2022. Available from www.training.cochrane.org/handbook.

Examples

es_from_rr_ci(
  rr = 1, rr_ci_lo = 0.5, rr_ci_up = 2,
  n_cases = 42, n_controls = 38, baseline_risk = 0.08
)

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