0 Replies Latest reply on Dec 1, 2016 9:23 PM by G W

    Could you help me with this: compare the differences(SUM or AVG or STDEV ) between test results for the same ID.

    G W

      Hello .This problem has been troubled me for over a month.

      Here's the actual problem :there are lots of products, each of them has an ID. Each of them is tested several times,or just once.

      I want to compare data from row "TEST RESULT" of the same ID to evaluate stability of the test machine.

      But now I am having trouble finding the ID that was tested at least 2 times .

      Even after that,I am not sure how to compare their test results. Maybe avg(first-time-result minus second-time-result)  through days or hours?   

      I really need some advice, thank you .