I am interested in corresponding industry codes from the 1940, 1950, 1960, 1970, and 1980 IPUMS-USA into SIC 1972. I see from a prior forum (Crosswalk between IND1950 and SIC and/or NAICS?) that the best method to do this is to create my own crosswalk using the IPUMS Codebooks.
I see that the 1980 Codebook includes the associated 1972 SIC codes. However, the 1950 and 1960 codebooks do not indicate which series of SIC codes are listed. Are they the 1972 SIC codes as well? Further, the 1940 and 1950 Codebooks do not appear to have any corresponding SIC codes listed. Do you know where I may be able to find the correlations between these years’ industry codes and SIC?
Finally, it seems that it would be more straightfoward to create a crosswalk from IND1950 or IND1990 to SIC 1972, rather than converting the distinct IND codes for each decade. Is there any way to do this?
Thank you very much for your assistance.