Definitions

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 Temporal design

Component of monitoring design that describes the temporal periods for the study and the sequence of re-visits at each site selected by the spatial design.

 Temporal unit

Blocks of time for which a metric value could be determined, in principle, if the temporal unit were to come into the sample.

 Trend

Long-term temporal pattern (i.e. change over time) in what you are monitoring.

 Two-stage sample

A simple case of a multi-stage sample. In this case the population to be sampled is first classified into primary units, each of which consists of a collection of the basic sampling unit, the secondary unit. A sample of these primary units is taken, constituting the first stage, and these are then subsampled with respect to their secondary units: this constitutes the second stage. OECD Source: 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.