Steps for somersd Kendall's tau for complex survey data

[Pragati Godbole]

I am interested in comparing 2 ordinal variables from 2 independent-survey datasets by DISCO. I have the pweight and the strata variable for both datasets.
I believe Kendall’s tau is the best way to assess this using the somersd pkg in Stata 15.1. However, I am unclear as to the steps to follow to conduct this comparison:

I appended the datasets together retaining the original variable names and adding a source (year) variable
Created a variable super_strata

 egen int super_strata = group(source q36)

After the above steps is when I’m unsure of the steps to run taua
Here’s my code

 svyset [pweight = Final_We], strata(super_strata) 
drop if DISCO == 0
drop if DISCO == 3
somersd  q24a q20a, taua

I receive the error message no observations
r(2000);

Are any of these steps correct? Would appreciate help for conducting these comparisons

Thank You!

* Example generated by -dataex-. To install: ssc install dataex
clear
input double(q36 q24a q20a) int source double Final_We float DISCO int super_strata
19 . 1 2018 14229.0917 2 19
19 . 1 2018  8471.5482 2 19
19 . . 2018  8471.5482 2 19
19 . 1 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . 1 2018  8471.5482 2 19
19 . 1 2018  8471.5482 2 19
19 . 1 2018  8471.5482 2 19
19 . 2 2018  8471.5482 2 19
19 . 1 2018 14229.0917 2 19
19 . 1 2018  8471.5482 2 19
19 . . 2018  8471.5482 2 19
19 . 1 2018 14229.0917 2 19
19 . . 2018  8471.5482 2 19
19 . 1 2018  8471.5482 2 19
19 . . 2018  8471.5482 2 19
19 . . 2018  8471.5482 2 19
19 . . 2018  8471.5482 2 19
19 . . 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . 1 2018  8471.5482 2 19
19 . . 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . 1 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . 2 2018  8471.5482 2 19
19 . 4 2018  8471.5482 2 19
19 . 2 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . . 2018  8471.5482 2 19
19 . 2 2018 14229.0917 2 19
19 . 2 2018 14229.0917 2 19
19 . 1 2018  8471.5482 2 19
19 . . 2018  8471.5482 2 19
19 . 2 2018 14229.0917 2 19
19 . 1 2018 14229.0917 2 19
19 . 2 2018  8471.5482 2 19
19 . . 2018 14229.0917 2 19
19 . . 2018  8471.5482 2 19
19 . 3 2018  8471.5482 2 19
19 . . 2018  8471.5482 2 19
19 . . 2018  8471.5482 2 19
19 . 1 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . . 2018  8471.5482 2 19
19 . 1 2018  8471.5482 2 19
19 . 1 2018  8471.5482 2 19
19 . 1 2018 14229.0917 2 19
19 . 1 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . 2 2018 14229.0917 2 19
19 . 1 2018  8471.5482 2 19
19 . . 2018 14229.0917 2 19
19 . 1 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . 1 2018  8471.5482 2 19
19 . 2 2018  8471.5482 2 19
19 . . 2018  8471.5482 2 19
19 . . 2018  8471.5482 2 19
19 . 1 2018  8471.5482 2 19
19 . . 2018  8471.5482 2 19
19 . 1 2018 14229.0917 2 19
19 . . 2018  8471.5482 2 19
19 . 1 2018  8471.5482 2 19
19 . . 2018 14229.0917 2 19
19 . 1 2018  8471.5482 2 19
19 . 2 2018 14229.0917 2 19
19 . 1 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . . 2018 14229.0917 2 19
19 . 4 2018  8471.5482 2 19
19 . 2 2018  8471.5482 2 19
19 . 2 2018  8471.5482 2 19
19 . 4 2018 14229.0917 2 19
19 . 2 2018  8471.5482 2 19
19 . 2 2018  8471.5482 2 19
19 . . 2018 14229.0917 2 19
19 . 1 2018 14229.0917 2 19
20 . . 2018 19362.7462 2 20
20 . . 2018 11527.9627 2 20
20 . . 2018 11527.9627 2 20
20 . . 2018 19362.7462 2 20
20 . 4 2018 11527.9627 2 20
20 . 1 2018 11527.9627 2 20
20 . 1 2018 11527.9627 2 20
20 . 4 2018 11527.9627 2 20
20 . . 2018 19362.7462 2 20
20 . . 2018 11527.9627 2 20
20 . 2 2018 11527.9627 2 20
20 . . 2018 11527.9627 2 20
20 . . 2018 19362.7462 2 20
20 . 1 2018 11527.9627 2 20
20 . 1 2018 19362.7462 2 20
20 . 2 2018 11527.9627 2 20
20 . . 2018 11527.9627 2 20
20 . 1 2018 11527.9627 2 20
20 . 1 2018 11527.9627 2 20
end
label values q36 q36
label def q36 19 "Delta North", modify
label def q36 20 "Delta South", modify
label values q24a q24a
label values q20a q20a
label def q20a 1 "Very badly", modify
label def q20a 2 "Fairly badly", modify
label def q20a 3 "Neither good nor bad", modify
label def q20a 4 "Fairly well", modify
label values DISCO DISCOlabel
label def DISCOlabel 2 "Benin DISCO", modify