Quality index of pre-school

This is a development key. The index is based on the proportion with pre-school teacher ID in municipal preschool, proportion of children 1-5 years in the municipality enrolled in preschool and staff density in municipal preschool. The key figures are normalised so that all municipalities’ values are placed on a scale from 0 to 100 where 0 is the worst and 100 is the best. To avoid excessive impact, the value is set to 0 for municipalities with values below percentile 2.5, and 100 for municipalities with values above percentile 97.5. For those municipalities that have data on all KPIs, the unweighted average is calculated, and then the mean is also normalised to a scale of 0 to 100 in the same way.