The Functional States Index is a conglomeration of the following: The Human Development Index[1], The Happy Planet Index[2],The Global Peace Index[3], The Democracy Index[4], Income Inequality based on the Gini Coefficient[5], and IMF account balance as a percentage of GDP[6].
A sub-score for each one of these was found with the following formula, where x is the score for the country from the original source, and max (x) and min (x) are the most positive score any country had from that source:
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For example, the Human Development Index score for Egypt was 0.734. The high and low scores on the Human Development Index were 0.968 (Iceland) and 0.284 (Somalia), so Egypt's sub-score regarding this source would be
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To give one more example, the Global Peace Index score for Israel was 3.052. The high and low scores on the Global Peace Index were 1.176 (Iceland) and 3.514 (Iraq) (note that the high score here is actually the smaller number), so Israel's sub-score regarding this source would be
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Each state's Functional States Index score is the average of all six subscores, with the Happy Planet Index receiving double the weight of the other sub-scores, as a country's ecological footprint is likely to have a greater effect on it's long term sustainability than other factors.