survreg
and coxph
survreg.control(maxiter=30, rel.tolerance=1e-09, failure=1,
toler.chol=1e-10, iter.max, debug=0, outer.max=10)
coxph.control (eps = 1e-09, toler.chol = .Machine$double.eps^0.75,
iter.max = 20, toler.inf = sqrt(eps), outer.max = 10)
maxiter
survreg
, coxph