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CPS2111 Grant J. Cameron et al.
                More  importantly,  the  SPI  is  built  on  the  conceptual  and  theoretical
            framework laid out above, while the theoretical principles of the SCI are not
            clearly formulated. For comparison, we plot in Figure 1 the SPI and SCI scores
            against log of GDP per capita (Panel A) and economic complexity index (Panel
            B) for the 146 countries covered by both indexes. The slopes of the fitted lines
            for the SPI scores are clearly steeper than those for the SCI scores in both
            these graphs.
             Figure 1: SPI and SCI Scores versus Country Income and Country Economic Complexity,
                                                2016
































                We  also  run  regressions  of  the  SPI  and  SCI  scores  on  these  country
            characteristics. Estimation results suggest that richer countries, or countries
            with a more complex economy tend to have higher SPI scores. Indeed, for this
            sample of countries, a 10 percent increase in a country’s GDP per capita is
            associated with approximately a 0.6 percentage point increase in its SPI score,
            twice  the  corresponding  increase  for  the  SCI.  Similarly,  a  0.1  increase  in  a
            country’s ECI being associated with a 1.5 percentage point increase in its SPI
            score but only a 1.1 percentage point increase in its SCI score. (Notably, these
            correlations are stronger for the larger sample of more than 200 countries that
            the SPI covers).
                Another strength of the SPI is that it is explicitly built around four main
            dimensions: i) Methodology, Standards and Classifications (MSC), ii) Censuses
            and Surveys (CS), iii) Availability of Key Indicators (AKI), and iv) Dissemination
            Practices  and  Openness  (DPO).  (We  further  discuss  each  dimension,  its
            indicators, and other practical implementation details in the paper). But suffice


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