I am currently undergoing a study on economic growth in 11 countries: Bangladesh, Egypt, Indonesia, Iran, Mexico, Philippines, Pakistan, South Korea, Turkey and Vietnam. I plan to use panel regression. I plan to follow an analysis such as Islam (1995) and Barro (1991) with an augmented Solow model with human capital.
As my human capital variable I am using the "Index of human capital per person" (based on years of schooling and returns to education), from the Penn-world tables. My question is, how would I go about finding the savings ratio $S_h$ i.e. the investment in human capital from the above index?