Environmental Performance Index 2026

Missing value codes

-9999	  the as-received dataset has cells with missing values
-8888	  the country is not in the as-received dataset
-7777	  the missing values are missing because they are not material
-6666	  at least one variable used to calculate the metric is missing
-5555	  the as-received dataset does not cover the years
-4444	  the data values are not reliable due to country size