add missing variable definition

Author: Christopher Prener

NEWS.md

@@ -1,3 +1,7 @@
+# vacancy-data v0.2.1
+
+* add missing variable definition to comparison data `METADATA.md` file
+
 # vacancy-data v0.2.0
 
 * Updated release with new data - comparison of Urban Prairie data with the STL Vacancy Initiative data release from June 2018

data-2017/comparison/METADATA.md

@@ -52,3 +52,4 @@ Bracketed references indicate which of the four spreadsheets listed above contai
 * `compare_type` - does the simplified property type (`"lot"` or `"building"`) in the city data match the prairie data? [1,2]
     - `"matched"` - the property type is the same in the city and prairie data
     - `"unmatched"` - the property type is not the same in the city and the prairie data
+* `p_low` - were data included the low estimate from the prairie paper? [1-3]