Researchers have built a database to reflect the impact of the COVID-19 pandemic on Boston northeastern NaturePortfolio
of aggregate measures. The first set of checks are specific to the content of each individual data source, the second is generalized across data sets, and the third and fourth involve coordinating aggregate measures from across data sets with each other and with demographic measures from the U.S. Census Bureau’s American Community Survey.The data records are derived from official and public sources, but they might still contain errors of various sorts.
For data sets measuring crime and disorder , all measures are based on the tabulation of records matching pre-defined subsets of case types. The names of these case types occasionally change with shifts to the database system. This happened when 911 switched to a completely new system in 2014 and in more incremental ways for 311. For the former, we have included a crosswalk between old and new case type names in the full documentation.
To filter outlier Craigslist listings with prices that are likely typos or designed as attention-grabbing spam we omitted the highest and lowest 0.2% of records before any aggregation calculations following previous work with these dataTo ensure the Place of Interest summary file only contained non-residential places, parcels not referenced by the online sources were removed if they had a residential land-usage according to the property assessment database .
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