efftox_get_tox: Get the Prob(Tox) for Prob(Eff) and utility pairs

In trialr: Clinical Trial Designs in 'rstan'

Get the Prob(Tox) for Prob(Eff) and utility pairs

Description

Get the probability of toxicity for probability-of-efficacy and utility pairs

Usage

efftox_get_tox(eff, util, p, eff0, tox1)

Arguments

eff	Probability of efficacy; number between 0 and 1
util	Utility score; number
p	p-index of EffTox utility contours. Use efftox_solve_p
eff0	Efficacy probability required when toxicity is impossible; a number between 0 and 1
tox1	Toxicity probability permitted when efficacy is guaranteed; a number between 0 and 1

Value

Probability(s) of toxicity

Note

Various ways of vectorising the function are demonstrated in the examples

See Also

efftox_solve_p

Examples

p <- efftox_solve_p(0.5, 0.65, 0.7, 0.25)

prob_tox <- efftox_get_tox(0.7, 0, p, eff0 = 0.5, tox1 = 0.65)
round(prob_tox, 2) == 0.25

prob_tox <- efftox_get_tox(0.7, seq(-0.5, 0.25, by = 0.25), p, eff0 = 0.5,
                           tox1 = 0.65)
round(prob_tox, 2) == c(0.57, 0.41, 0.25, 0.09)

prob_tox <- efftox_get_tox(c(0.5, 0.7, 0.8), 0.25, p, eff0 = 0.5, tox1 = 0.65)
round(prob_tox, 2) == c(NaN, 0.09, 0.22)

prob_tox <- efftox_get_tox(c(0.5, 0.7, 0.8), c(-1, 0, 1), p, eff0 = 0.5,
                           tox1 = 0.65)
round(prob_tox, 2) == c(0.63, 0.25, NaN)

trialr documentation built on April 1, 2023, 12:03 a.m.