Hello NHGIS folks,
This is Dafeng who previously worked in MPC! I have a question about NHGIS variable —
When I choose to generate farm population and urban population variable between 1870 to 1950, I just cannot find these variables after I “apply filters”. Here is what I do: I choose “state and county” as geographic levels, and then choose “1870 to 1950” as years. But there is nothing about farm status and urban status in “Select Data”. I am wondering what is missing here? I am sure that these variables were surveyed in these census years.
A related question: there is indeed a variable called “average value of farmland” retrieved from the agriculture census data, at the county level. But when I try to generate the table, NHGIS continuously warns me that “One or more tables lack a geographic level selection (see below)” but I have chosen state and county. Did I do something wrong here?