I’ve been investigating property tax topcodes in the ACS IPUMS variable PROPTX99 and its source variables.
The IPUMS documentation says its maximum category value (69) reflects reported values higher than 10,000 USD in all years for which the variable is available. Moreover, the editing procedure says: “If the reported real estate taxes (PROPTX99) exceed the top code, the value will be replaced with the top code.”
The ACS PUMS documentation of the Census Bureau says that reported values are topcoded if they exceed a “top-code national minimum value”.
For every year, the Census Bureau publishes tables showing this minimum value (which varies between years and sometimes even between states) as well as the mean of all reported property taxes exceeding it. This description and data is also available on the ACS IPUMS page on TOP CODED AND BOTTOM CODED VALUES FOR ACS/PRCS SAMPLES BY STATE.
Given this information, I would like to clarify how the 10,000 USD topcode was implemented in the IPUMS ACS variable PROPTX99:
Does the editing procedure use the year (and state) specific minimum value? Or does it simply set values above 10,000 USD equal to 10,000 USD – irrespective of the year (and state)?
Thanks for your answer!