Subset of 2018-2019 Public Schools characteristics file obtained from: 
https://data-nces.opendata.arcgis.com/datasets/146f28635d01435e978c6d2d5ccf6ea9_0?geometry=127.752%2C-16.847%2C-159.475%2C72.114
-	Remove schools that are “Full Virtual” or “Virtual with Face to Face Options”
-	Remove schools classified as “Alternative”
-	Remove schools classified as “Vocational”
-       Use "TOTAL" (total enrollment) as weighting for surrogate
