What does mean fixation index (F value) values get minus values in the analysis of heterozygosity, F-statistics and polymorphism by population for codominant data in GeneAlex?
F mean = -0.832
F Max = 0.976
F Min = -1.000
it simply means fixation index is 0. Theoretically, Fst cannot be less than 0, but calculations through software still give minus value. you can consider it as approximate to 0 and proceed.
In theory Fst should be between 0 and 1, but in practice Fst can become negative when the heterozygosity in the subpopulation is higher than in the total population. I have never seen that but theoretically that can happen in some cases when individuals are assigned to the wrong subpopulation.
If you get negative values which are close to 0 I agree with Gayani, you can consider them as 0. However, with values of -1 (and a mean of -0.8) I would not simply proceed but rather check the data again.
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