Convert Between Odds Ratios, Risk Ratios and Other Metrics of Change in Probabilities
Source:R/convert_between_riskchange.R
oddsratio_to_riskratio.Rd
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 oflog(odds(p1)/odds(p0))
, Risk ratio ofp1/p0
, Absolute Risk Reduction ofp1 - p0
, or Number-needed-to-treat of1/(p1 - p0)
.OR
andlogOR
can also be a logistic regression model.- p0
Baseline risk
- log
If:
TRUE
:In
oddsratio_to_*()
,OR
input is treated aslog(OR)
.In
*_to_oddsratio()
, returned value islog(OR)
.
FALSE
:In
logoddsratio_to_*()
,logOR
input is treated asOR
.In
*_to_logoddsratio()
, returned value isOR
.
- 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))
#> [1] 3.5
(RR <- p1 / p0)
#> [1] 1.75
(ARR <- p1 - p0)
#> [1] 0.3
(NNT <- arr_to_nnt(ARR))
#> [1] 3.333333
riskratio_to_oddsratio(RR, p0 = p0)
#> [1] 3.5
oddsratio_to_riskratio(OR, p0 = p0)
#> [1] 1.75
riskratio_to_arr(RR, p0 = p0)
#> [1] 0.3
arr_to_oddsratio(nnt_to_arr(NNT), p0 = p0)
#> [1] 3.5
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
#> Parameter | Risk Ratio | 95% CI
#> ---------------------------------------
#> (Intercept) | 0.73 |
#> cyl [6] | 0.59 | [0.11, 1.16]
#> cyl [8] | 0.20 | [0.02, 0.70]
#>
#> Uncertainty intervals (profile-likelihood) and p-values
#> (two-tailed) computed using a Wald z-distribution approximation.