EQI impartiality pillar, country centered and z-score standardized. For its calculation, they aggregate the individual scores (‘survey question’) to the corresponding regional level, so that each of question assessing impartiality in the provision of public services is now a regional ‘indicator’. After normalizing each of impartiality indicators (through z-score standardization) so that they share a common range, the impartiality indicators are aggregated into ’impartiality pillar’.