Nothing
data("student_offers")
## A model that does not converge to global max
f1 <- offer + accept ~ gender1 | gender2
m1 <- ultimatum(f1, maxOffer = 100, data = student_offers, s2 = 1)
p1 <- profile(m1) ## Issues warning
plot(p1)
## Refit model with better starting values
m2 <- ultimatum(f1, maxOffer = 100, data = student_offers, s2 = 1, profile = p1)
p2 <- profile(m2)
plot(p2)
logLik(m1)
logLik(m2) ## Improved
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