Four-Parameter Weibull Distribution with Lower and Upper Limits Applicable in Reliability Studies and Materials Testing

A simply curved Weibull plot means that the studied data set has a three-parameter distribution with non-zero location parameter representing lower or upper limit of set. This paper introduces four-parameter both these limits can be applied in reliability and materials engineering. very reliable indicator this is double-curved plot. The great advantage fact corresponding hazard rate curve bathtub-shaped ability to fit measured data.