Explains Quality of Life Indexes At This Website
Quality of Life Index
is an estimation of overall quality of life by using empirical formula (the formula is an our opinion and it's based on experiments).
The actual formula might be changed. Currently, we put the highest weight to pollution - if the environment is polluted too much, the economy or safety cannot fulfill it.
We put the second highest importance to safety, since it is more important to feel safe rather than wealthy, in our opinion. etc. The number 65 is added so that
the numbers are in such range so it rarely goes under zero (65 is a range modifier).
index.main = 65 + purchasingPowerInclRentIndex - (priceToIncomeRatio * 2) - cpiIndex / 5
+ safetyIndex * 3 / 4 + healthIndex / 2 - trafficTimeIndex / 2 - pollutionIndex;
For details how purchasing power (including rent) index
property price to income ratios
are calculated please look up their respective pages.