Clinical and Nonclinical Effects on Operative Duration: Evidence from a Database on Thoracic Surgery

Algorithm 1

LFFSA.

	Set , and initialize the change point . Denote as the number of surgeries in an OR.
(1)	let and , where if and 0 otherwise.
(2)	Substitute the term in the linear model (c is the coefficient of x) with .
(3)	Improve the change point estimate by .
(4)	Stop the process if , where is a small number. Otherwise, let go to Step 1.