How are the interviewees selected?
Interviewing all Finns would be very expensive and difficult. Therefore, the basis of our data collections is a sample drawn from a population, such as the database on the population of Finland.
Probability-based rules have been determined for forming the sample. The random sample thus formed, enables generalisation of the results sufficiently accurately to the population and measuring of the uncertainty caused by the sample. Because each person drawn to the sample represents several persons, it is important that we receive data from as many persons drawn to the sample as possible. You cannot register for the sample. Statistics Finland always contacts the persons or enterprises selected to the sample in advance either by letter or email.
The sampling methods used by us are based on statistical science and thus they ensure reliable results, saves costs, help collect more detailed data on the survey topic and enables faster production of the results.