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Close Enough? Using the WGI as a Proxy for the WJP Rule of Law Index
A practical R analysis testing whether the World Bank's Worldwide Governance Indicators (WGI) rule of law measure can serve as a proxy for the World Justice Project's (WJP) Rule of Law Index. The WGI covers more countries over a longer period (1996, 199 countries) vs WJP (2012, 97 countries). Cross-country correlations are strong (median 98% by region/year), first-difference analysis shows a pooled correlation of 0.36, and country-level agreement is weaker due to measurement noise dominating the signal. Conclusion: WGI is a serviceable but imperfect stand-in for WJP when longer time series or broader country coverage is needed. Full R code using tidyverse, readxl, janitor, and countrycode is provided.