Generalized Accelerated Failure Time Frailty Model for Systems Subject to Imperfect Preventive Maintenance

Table 3

Statistical analysis of the predicted RUL using G-AFT-F and EPHM for the testing samples that fail before receiving any PM activity.

Actual RUL	10	9	8	7	6	5	4	3	2	1
G-AFT-F
Mean	9.93	8.96	7.90	7.06	6.05	4.86	3.80	3.07	2.09	1.24
SD	0.65	0.76	0.43	0.86	0.75	0.75	0.86	0.43	0.35	0.27
EPHM
Mean	9.91	9.03	7.95	7.04	6.01	5.03	3.98	3.06	2.12	1.32
SD	0.57	0.69	0.97	0.48	0.59	0.76	0.57	0.58	0.63	0.59

SD = standard deviation.