Derivation
variable: repgp (table[s]: crs_cenm, css_sei_all)
variable: cluster (table[s]: crs_cenm, css_sei_all)
variable: hhlistno (table[s]: crs_cenm, css_sei_all)
variable: membno (table[s]: crs_cenm, css_sei_all)
variable: crsno (table[s]: crs_memball, NCD_combined_data_all_final [derived table])
egen crsno=concat(repgp cluster hhlistno membno) if repgp~=""