Derivation
variable: informant (table[s]: combined_tb_cases_controls_final)
variable: infmtype (table[s]: css_sei_all, crs_cenm)
la def informtype 1 "Self" 2 "Parent" 3 "Other relative (inc spouse/inlaw)" 4 "Non-relative" 8 "Unknown" 9 "Missing"
gen informtype=1 if infmtype==6 | informant==1
replace informtype=2 if infmtype==5 | informant==2
replace informtype=3 if infmtype==1 /*Partner/sibling/child*/| infmtype==2 /*Grandparent/grandchild/other relative*/ | informant==3 /*Child/niece/nephew/grandchild*/ | informant==4 /*Sibling/cousin*/ | informant==5 /*Spouse*/ | informant==6 /*In-law*/ | informant==7 /*Grandparent/Aunt/Uncle*/
replace informtype=4 if infmtype==3 /*Key informant*/ | infmtype==4 /*Neighbour/non-relative*/ | informant==8 /*Non-relative*/
replace informtype=8 if infmtype==8
replace informtype=9 if infmtype==9
la val informtype informtype
