Fundamental Question for a statistical study, the reliability of our measurement system. Without reliable data, the study and associated conclusions will not be meaningful.
The Gage R & R is used to measure the reliability of a measuring system.
The method of averaging and ranges is one of two methods most used to identify the precision of a measuring system and its capability to a demand.
The method by analyzing the variance is the most accurate method. It has the advantage of taking into account the interaction it can have between the operators and the Part.
The Kappa Test is the pendant of Gage R & R for qualitative data. Very useful for quality control, it helps to help its reliability.