Explanation:

The HDI assigns equal weight to all three dimension indices; the two education sub-indices are also weighted equally. The choice of weights is based on the normative assumption that all human beings value three dimensions equally. Research papers that provide a statistical justification for this approach include Noorkbakhsh (1998) and Decanq and Lugo (2009). The choice of minima and maxima for transformation of component indicators into indices gives more equal ranges of variation of dimension indices - implying that the effective weights are more equal than it was before.