Levels of Social Capital in the Japanese prefectures were estimated on the basis of the Studentized regression residuals (R-score) of ten kinds of social statistics such as number of murders, suicides. The partial correlation between the R-scores was extremely high and was shown to reflect a direct effect of Social Capital in the latent factor analysis. Thus, the estimated Social Capital could be used as a control index to evaluate the strength of the social indicators ever reported.
The six social indicators (the Terashima's Happiness Index, the Kobayashi 's Happiness Index for children, the Sakamoto's Happiness Index, the Wealth Index made by the Cabinet's Office, the Social Capital Index made by Cabinet's Office, and the Yamauchi's Civil Society Index) that were reported to represent wealth and/or happiness in community were rated in terms of how strong they reflected Social Capital by comparing with the average R-score.