Table 1.

Estimates of errors of national and gridded GDP data used in estimates of combined measures of output

Estimates for country outputEstimates for grid-cell output
Country grade1-y growth rate, %Output level, %1-y growth rate, %Output level, %
  • Country grades are from the Penn World Table and ref. 17. Estimated errors by authors are described in SI Appendix. Generally, A countries have highest-quality systems, C countries are middle-income countries, and grade E countries have little or no operative statistical systems and often have not had population censuses for at least a decade. A list of countries by grade is provided in SI Appendix.