Unemployment rates are calculated as the number of unemployed people divided by the economically active population.
Panel data (or time series cross section) means that we have data from many units (Individuals, countries etc.), over many points in time.
Time series analysis is a specific way of analysing a sequence of data points collected over an interval of time.
a type of data collected by observing many subjects (such as individuals, firms, countries, or regions) at the one point or period of time.
An index shows the development of a number over time. It shows the change of a figure from one point in time to another. The ‘base year’ is usually set to 100. An index value of 110 then indicates an increase by 10 % compared to the value in the reference period.