What is the specific name of the statistical method that verifies linear association using the contrast command after stcox?

[Heebyung Koh]

Hi

What is the specific name of the statistical method that verifies linear association using the contrast command after stcox?

stset time_mortal , failure(ev_mortal) scale(365.25) id(n_eid)
stcox i.group_exposure
contrast p.group_exposure, noeffects

Thanks in advance.

Hee Byung Koh