Study on t-test method to find linear systematic error

The advantages and shortcomings of three methods to find linear systematic error were analyzed. Malikov criterion is the most common method, but it often produced wrong judgment in application. The invalidation reason of Malikov criterion was analyzed, and then the t-test method was developed to find linear systematic error. The t test method can exactly judge whether there is linear systematic error in measure data list according to the consistency of the anterior and posterior half measure data.