add year_structure_built_built_before_1960_percent

UI-Research / urbnindicators

Out of the Box Social Science Indicators from the American Community Survey (ACS)

https://ui-research.github.io/urbnindicators/

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add year_structure_built_built_before_1960_percent #11

Closed rogin123 closed 4 months ago

rogin123 commented 4 months ago

this variable is often used as a proxy for lead exposure. Sum of "year_structure_built_built_1950_1959" "year_structure_built_built_1940_1949" "year_structure_built_built_1939_earlier"