Hasan Rasay

Lifetime data has some distinguishing features which make the development of control charts for lifetime monitoring more demanding, i.e., the data is usually censored, and has non-normal-skewed distributions. To deal with censored data, different schemes are proposed, right censoring, left censoring and interval censoring are among others. In this paper, to monitor the lifetime data of Weibull distribution, a variable control chart is developed. The data is obtained according to a type II right censoring which is also known as failure censoring. The performance of the proposed control chart is compared with another control chart presented in the literature. In designing the control charts, a new parameter is introduced which arbitrarily distributes type I error between the upper control limit and lower control limit of the control charts. By changing this parameter, the one-sided and two-sided control charts can be easily provided. Using simulation studies, applications of the control charts are illustrated. Also, a discussion regarding the applications in real data is provided.