Is it possible to identify significant cross-country differences and over-time changes in governance using the WGI data?
Yes. For approximately two-thirds of all possible pairwise country comparisons on the WGI, margins of error reflecting 90% confidence intervals do not overlap, indicating statistically significant differences. Looking at changes over time over long periods such as a decade, typically around 8 percent of countries covered will show a significant improvement or decline in the WGI measures. However, many small changes over shorter periods, or small differences between countries with similar ranks on the WGI, are not significant and should not be overinterpreted.
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