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NON-PROBABILITY SAMPLING

Statistics Directorate    
French Equivalent: Sondage non probabiliste

Definition:
A sample of units where the selected units in the sample have an unknown probability of being selected and where some units of the target population may even have no chance at all of being in the sample.

Forms of non-probability sampling are numerous, such as voluntary samples (only responses of volunteers are used), quota samples, expert samples.

Context:
The non-random selection of a sample of producers and products based on expert knowledge or judgement. Also known as “non-random sampling”, “purposive sampling” and “judgemental sampling”.

ILO, IMF, OECD, Eurostat, UNECE, World Bank, 2004, Producer Price Index Manual: Theory and Practice, International Monetary Fund, Washington DC

http://www.imf.org/external/np/sta/tegppi/index.htm.

Source Publication:
Assessment of the Quality in Statistics, Fifth meeting, Luxembourg, 2-3 May 2002, Eurostat, Item 4: Glossary.

Cross References:
Judgement sample
Probability sampling

Statistical Theme: Methodological information (metadata)

Created on Wednesday, August 21, 2002

Last updated on Thursday, August 11, 2005