Imagine if I have 3 types of parts A, B, C and there is one parameter to judge the quality of the parts under certain condition, but this parameter is not that reproducible. For example, under certain condition, A, B and C will have different value of electric surge. I understand if we collect large quantity of data, we can do t-test to compare among each two of them. But if under the condition, the electric surge on A, B and C is not that reproducible. Ex: there is percentage of chance for A, B, C to have electric surge. How can I combine this percentage of occurrence and absolute value of electric surge to determine which part is better. ( I would like to consider less occurrence rate and low electric surge value as the good one). What statistic method would be suitable for this situation?