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I was working on a cox regression problem and was refering to this link:

http://support.sas.com/documentation/cdl/en/statug/63347/HTML/default/viewer.htm#statug_phreg_sect050.htm

I have few questions regarding to this:

As in the example mentioned, can we feed missing values to model? Also how do we handle multicollinearity in such a data setup.

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