The interval data in this example is read from a SAS data set with a special structure. All units must have a common inspection schedule. This type of interval data is called readout data. The SAS ...

Jong S. Kim, EFFICIENT ESTIMATION FOR THE PROPORTIONAL HAZARDS MODEL WITH LEFT-TRUNCATED AND "CASE 1" INTERVAL-CENSORED DATA, Statistica Sinica, Vol. 13, No. 2 (April 2003), pp. 519-537. Free online ...