LC: Which segment size should I choose?

Hey,

according to Technical Paper (2019), the segment size with the lowest CAIC and/or the highest relative chi-square should be chosen.
In my LC the segment size with the lowest CAIC has at the same time the lowest relative chi-square. Additionally the segment size with the highest relative chi-square has the highest CAIC.
Does anyone have a solution for this problem?

Thanks a lot,
Simon