I want to use the 2007 Ethiopia census for analysis. I wonder, however, at which admin level the census provides representative information. The sample overview information states that the geographical unit is the Zone, which is admin level 2. However, when I look at various census documents and at a description of the census at the World Bank microdata website (Ethiopia - Population and Housing Census 2007 - IPUMS Subset), the refer to the wereda, which is a admin level 3. I suspect that it is the latter, which means there is a mistake on the IPUMS website. Can you please clarify?