Parameter Estimations of the TFR Model under Gompertz Distribution at a Normal Stress

The TFR (Tampered Failure Rate) model was Proposed by Bhattacharyya and Soejoeti (1989) for step-stress accelerated life tests. This paper point out that the strategy provided in for seeking parameter estimates under normal stresses in step-stress Completely accelerated tests using the usual regression analysis is unreasonable, and offers a method of estimating Parameters under a normal stress. For the sake of convenient expression, the paper considers simple SSALT only, but multiple SSALT can be studied similarly.