Main NLS Page ENSO Dataset
Additional Information
Dataset Name:	ENSO
Procedure:	Nonlinear Least Squares Regression Certification Method & Definitions
Data:	1 Response Variable (y) 1 Predictor Variable (x) 168 Observations Average Level of Difficulty Observed Data
Model:
	These data are monthly averaged atmospheric pressure differences between Easter Island and Darwin, Australia. This difference drives the trade winds in the southern hemisphere. Fourier analysis of the data reveals 3 significant cycles. The annual cycle is the strongest, but cycles with periods of approximately 44 and 26 months are also present. These cycles correspond to the El Nino and the Southern Oscillation. Arguments to the SIN and COS functions are in radians.