I searched the forum for related questions on this - apology if I missed an important point - but I’d like to know more about the creation of variable INDGEN from unrecorded variable IND, and likewise OCCISCO from OCC. I understand that IND is recorded according to the original national industry classification, but I have trouble finding the industrial classification standard that particular country follows (e.g. HS, SITC, NAICS) except for a few, e.g. Canada 1980 SIC, Nicaragua ISIC 3.1. Since there are numerous conversion tables between standard industry classifications, I could potentially use them for harmonization. However, if the original industry classification standard is unknown, I am wondering how IPUMS-I managed to convert IND into INDGEN by ISIC Rev 4.
I am asking this question because I need to construct a finer harmonized industry variable than INDGEN from variable IND, say at 3-digit level. I would extremely appreciate it if you could have some advice on how to efficiently harmonize the IND variable at finer level. Likewise, advice on harmonizing occupation code would be equally appreciated.
Thanks very much,