Eitodennäköisyysotannan
Eitodennäköisyysotanta, known in English as unequal probability sampling, is a sampling technique where each unit in the population does not have an equal chance of being selected for the sample. This contrasts with simple random sampling, where every unit has an identical probability of inclusion. Unequal probability sampling is employed when certain population units are considered more important or informative than others, or when it is more efficient to survey some units over others.
There are various methods for implementing unequal probability sampling. One common approach is probability proportional to
The primary advantage of unequal probability sampling is its potential for increased efficiency and precision in