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INTERPENETRATING SAMPLES (SUB SAMPLES)

Statistics Directorate    
Definition:
When two or more samples are taken from the same population by the same process of selection the samples are called interpenetrating samples. The samples may or may not be drawn independently, linked interpenetrating samples being an example of the latter. There may be different levels of interpenetration corresponding to different stages in a multi-stage sampling scheme.

Context:
Thus, in a two-stage sampling scheme with village as the primary and household as the second stage unit, when the sample villages are distributed into two interpenetrating sub-samples we have interpenetration at the first stage only; but when the sample of households within every sample village is broken up into two interpenetrating sub-samples we have interpenetration at the second stage; and we can have interpenetration of a mixed type, e.g. the four sub-samples obtained by combining the two earlier types.

Generally, the sub-samples are distinguished not merely by the act of separation into sub-samples but by definite differences in survey or processing features, e.g. when different parties are assigned to different sub-samples, or one sub-sample is taken up earlier in time than others.

Source Publication:
A Dictionary of Statistical Terms, 5th edition, prepared for the International Statistical Institute by F.H.C. Marriott. Published for the International Statistical Institute by Longman Scientific and Technical.

Statistical Theme: Methodological information (metadata)

Created on Sunday, May 19, 2002

Last updated on Thursday, March 06, 2003