Strata argument from adonis2 can't be added

[AndreaVazgel]

I'm trying to perform a pairwise comparison for my data, but when I add the "strata" argument from adonis2 it shows an error:

ad2_pair3 = adonis_pairwise(x = Datos, dd = data_dis, group.var = "Hg_level", permut = 9999, p.adj = T, method = "bray", strata = Site)
ad2_pair3

Result:
Error in check(sn, control = control, quietly = quietly) :
Number of observations and length of Block 'strata' do not match.

However, I don't think that error make sense because I have run adonis2 with similar arguments and I didn't have any problem:
ad2 = adonis2(data_dis ~ Hg_level, data = Datos, permutations = 9999, method = "bray", strata = Site)
ad2

Result:
adonis2(formula = data_dis ~ Hg_level, data = Datos, permutations = 9999, method = "bray", strata = Site)
Df SumOfSqs R2 F Pr(>F)
Hg_level 2 3.128 0.0699 5.2609 0.0026
Residual 140 41.616 0.9301
Total 142 44.744 1.0000

• data_dis is my dissimilarity matrix
• Hg_level is my independent variable (3 levels)
• Datos is my general data.frame
• Site is another categorical variable (9 levels) for whose levels I want to constrain permutations

Do you know what is the solution for this error? Or, Is there another way to introduce this argument?

Thx,
Andrea.

[vmikk]

Hello Andrea,
Thank you for reporting this issue.
I'm afraid the current implementation of adonis_pairwise does not support strata argument.
I will add this enhancement to the to-do list.