The Gini index, Quintile Share Ratio and the at-risk-of-poverty rate, 2004-2014
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According to Eurostat procedures the years of the table refer to the survey year, the year the survey was implemented. The income reference period is the previous tax year.

The Gini-coefficient is a number between 0 and 100 which shows how the total income of everyone in the population is distributed. The Gini-coefficient would be 100 if one individual had all the income but 0 if everyone had equal income. For instance in the year 2011 the Gini-coefficient was 23,6 in Iceland.

The quintile share ratio shows the ratio of the total equivalised disposable income of the 20% of the population with the highest income to the total 20% with the lowest equivalised disposable income. In the year 2011 the highest quintile had 3.3 times the equivalised disposable income of the lowest quintile.
The EU-SILC is a sample survey which must be taken into account when looking at the results. In order to evaluate the uncertainty due to sampling error confidence interval is calculated (CI). The interval reaches equally far below and above the number it applies to and is added to and subtracted from the number. If evaluated at-risk-of-poverty rate is 10% and the confidence interval is +/- 1.2 the lower limit is 8.8 and the upper limit is 11.2 given 95% confidence level and therefore it can be stated that in 95% of samples of equal size the result would fall within the given interval. When comparing two numbers in order to see if the difference between them is large enough to be statistically significant one needs to look a the confidence interval of both numbers and see if they cross each other.