Proportional hazards assumption test
= Proportional hazards assumption test
{title2=$\beta_j(t)=\beta_j$}
A proportional hazards assumption test assesses whether fitted covariate coefficients remain constant over time. A common implementation uses trends in <scaled Schoenfeld residuals>, with separate covariate tests and a joint global test. Failure to reject is compatible with proportional hazards, but does not establish the correct covariate functional form or <independent censoring>.