ssf_formula {amt} | R Documentation |
clogit
formula and returns a formula without the strata
and the
left-hand sideTakes a clogit
formula and returns a formula without the strata
and the
left-hand side
ssf_formula(formula)
formula |
A formula object |
f1 <- case_ ~ x1 * x2 + strata(step_id_)
ssf_formula(f1)