Sashelp Data Sets

El Niño–Southern Oscillation Data

The Sashelp.ENSO (El Niño–Southern Oscillation) data set contains measurements of monthly averaged atmospheric pressure differences between Easter Island and Darwin, Australia, for a period of 168 months (National Institute of Standards and Technology 1998). These pressure differences drive the southern trade winds. This data set is used to illustrate fitting nonlinear functions to a scatter plot by using methods such as loess and penalized B-splines. These data show both seasonal variations and variations due to El Niño. The following steps display information about the Sashelp.ENSO data set and create Figure B.9:

title 'El Nino Southern Oscillation Data';
proc contents data=sashelp.ENSO varnum;
   ods select position;

title 'The First Five Observations Out of 168';
proc print data=sashelp.ENSO(obs=5);

Figure B.9: El Niño–Southern Oscillation Data

El Nino Southern Oscillation Data

Variables in Creation Order
# Variable Type Len
1 Month Num 8
2 Year Num 8
3 Pressure Num 8

The First Five Observations Out of 168

Obs Month Year Pressure
1 1 0.08333 12.9
2 2 0.16667 11.3
3 3 0.25000 10.6
4 4 0.33333 11.2
5 5 0.41667 10.9