long-term trend

The prevailing tendency or general direction expected for some observed value over a lengthy and extended period of time, often determined by studying and analyzing statistical data. (Source: RHW / APD)



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Villacastin-Herrero CA, Underhill LG, Crawford RJM, Shannon LV 1996. Sea-surface temperature of oceans surrounding subequatorial Africa - seasonal patterns, spatial coherence and long-term trends. South Africa Journal of Science 92 189-197