oddsratio_to_riskratio: Convert Between Odds Ratios, Risk Ratios and Other Metrics of...

In effectsize: Indices of Effect Size

Convert Between Odds Ratios, Risk Ratios and Other Metrics of Change in Probabilities

Description

Convert Between Odds Ratios, Risk Ratios and Other Metrics of Change in Probabilities

Usage

oddsratio_to_riskratio(OR, p0, log = FALSE, verbose = TRUE, ...)

oddsratio_to_arr(OR, p0, log = FALSE, verbose = TRUE, ...)

oddsratio_to_nnt(OR, p0, log = FALSE, verbose = TRUE, ...)

logoddsratio_to_riskratio(logOR, p0, log = TRUE, verbose = TRUE, ...)

logoddsratio_to_arr(logOR, p0, log = TRUE, verbose = TRUE, ...)

logoddsratio_to_nnt(logOR, p0, log = TRUE, verbose = TRUE, ...)

riskratio_to_oddsratio(RR, p0, log = FALSE, verbose = TRUE, ...)

riskratio_to_arr(RR, p0, verbose = TRUE, ...)

riskratio_to_logoddsratio(RR, p0, log = TRUE, verbose = TRUE, ...)

riskratio_to_nnt(RR, p0, verbose = TRUE, ...)

arr_to_riskratio(ARR, p0, verbose = TRUE, ...)

arr_to_oddsratio(ARR, p0, log = FALSE, verbose = TRUE, ...)

arr_to_logoddsratio(ARR, p0, log = TRUE, verbose = TRUE, ...)

arr_to_nnt(ARR, ...)

nnt_to_oddsratio(NNT, p0, log = FALSE, verbose = TRUE, ...)

nnt_to_logoddsratio(NNT, p0, log = TRUE, verbose = TRUE, ...)

nnt_to_riskratio(NNT, p0, verbose = TRUE, ...)

nnt_to_arr(NNT, ...)

Arguments

OR, logOR, RR, ARR, NNT	Odds-ratio of odds(p1)/odds(p0), log-Odds-ratio of log(odds(p1)/odds(p0)), Risk ratio of p1/p0, Absolute Risk Reduction of p1 - p0, or Number-needed-to-treat of 1/(p1 - p0). OR and logOR can also be a logistic regression model.
p0	Baseline risk
log	If: TRUE: In ⁠oddsratio_to_*()⁠, OR input is treated as log(OR). In ⁠*_to_oddsratio()⁠, returned value is log(OR). FALSE: In ⁠logoddsratio_to_*()⁠, logOR input is treated as OR. In ⁠*_to_logoddsratio()⁠, returned value is OR.
verbose	Toggle warnings and messages on or off.
...	Arguments passed to and from other methods.

Value

Converted index, or if OR/logOR is a logistic regression model, a parameter table with the converted indices.

References

Grant, R. L. (2014). Converting an odds ratio to a range of plausible relative risks for better communication of research findings. Bmj, 348, f7450.

See Also

oddsratio(), riskratio(), arr(), and nnt().

Other convert between effect sizes: d_to_r(), diff_to_cles, eta2_to_f2(), odds_to_probs(), w_to_fei()

Examples

p0 <- 0.4
p1 <- 0.7

(OR <- probs_to_odds(p1) / probs_to_odds(p0))
(RR <- p1 / p0)
(ARR <- p1 - p0)
(NNT <- arr_to_nnt(ARR))

riskratio_to_oddsratio(RR, p0 = p0)
oddsratio_to_riskratio(OR, p0 = p0)
riskratio_to_arr(RR, p0 = p0)
arr_to_oddsratio(nnt_to_arr(NNT), p0 = p0)

m <- glm(am ~ factor(cyl),
  data = mtcars,
  family = binomial()
)
oddsratio_to_riskratio(m, verbose = FALSE) # RR is relative to the intercept if p0 not provided

effectsize documentation built on June 8, 2025, 12:42 p.m.