[R] About "STL" function

From: frossard victor <frossardvictor_at_yahoo.fr>
Date: Thu 18 May 2006 - 22:44:41 EST


Hi,
  I'm astudent in hydrobiology and I actually work on river's discharge and try to extract from my data the seasonal and trend components. I use STL function but I have several problems in understanding what this function have done.   I'd like to know what means the IQR results which gave me some % about the seasonal component, trend component and the remainder component.   Moreover, the graphic representation of "stl" function change the scale between the different part of the plot, my data have the good scale but the seasonal, trend and remainder component have an other scale. My data scale vary from 0 to 150 (m3/day), the trend scale go from 0 to 25, the seasonal scale vary from -10 to 20. Is that normal? has a change of units occur? what does it means?    

  Thanks for your answers.
  Victor.                     


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