ion models include linear regression (for the ``mean'' functional), logistic
regression with logit link (for the ``odds'' functional), Poisson regression with log link (for the
``rate'' functional), linear regression of a log-transformed outcome 
(for the ``geometric mean'' functional), and Cox proportional hazards regression (for the hazard functional).</p>
<p>Currently, for the hazard functional, only `coxph` syntax is supported; in other words, using `dummy`, `polynomial`,
and <code><a href="U.html">U</a