The 2005-2009 ACS 5-year PUMS has errors in the housing unit variable SMOCP (selected monthly owner costs). SMOCP is created by summing several variables associated with the monthly costs of owning a housing unit. For cases collected in 2005 and 2006, SMOCP was incorrectly calculated to include both annual mobile home costs (MHP) and monthly mobile home costs (MHP/12). As a result, SMOCP values were overestimated for all mobile homes.
This error affects cases on the housing unit records that were collected in 2005 and 2006. Cases collected in 2007-2009 were not affected. We are reviewing feasibility of re-releasing the 2005-2009 5-year housing files in the future.
To correct this error, use the SERIALNO variable to identify the data collection year, and then subtract MHP from SMOCP for all 2005-2006 cases where BLD=1 (mobile homes). Each case's data collection year is indicated in the first 4 digits of SERIALNO.