I'm trying to apply this to some data I have where I would like to look at
Census Block Groups nested within Zip Code Tabulation Areas. Specifically,
I'd like to compute a segregation index using Census Block Groups as the
lower units and Zip Code Tabulation Areas as the higher level units.
I am confused about how these R packages deal with this issue of non-nested
units. Here's the explanation from the tutorial:
"In order to get around this problem [non-nested units], we can use the
QGIS application to perform a geographic intersection between two spatial
polygon layers that we want to use. This will allow us to merge the
population data at the census tract level to a higher level, so we can
calculate a segregation index."
Can anyone say more about how this is possible? I can run the code in the
tutorial but I don't understand what it's doing.