Editing Likelihood function (section)

===Partial likelihood===
A partial likelihood is an adaption of the full likelihood such that only a part of the parameters (the parameters of interest) occur in it.<ref>
{{citation
 |last=Cox |first=D. R. |author-link=David Cox (statistician)
 |title=Partial likelihood
 |journal=[[Biometrika]]
 |year=1975 |volume=62 |issue=2 |pages=269&ndash;276
 |doi=10.1093/biomet/62.2.269 |mr=0400509
|mode=cs1 }}</ref> It is a key component of the [[proportional hazards model]]: using a restriction on the hazard function, the likelihood does not contain the shape of the hazard over time.