Deseasonalization and detrending of Keeling curve

CO2 concentrations in atmosphere measured at Mauna Loa in Hawaii are
known as Keeling curve, http://en.wikipedia.org/wiki/Keeling_curve You
can get the update date from
http://scrippsco2.ucsd.edu/data/in_situ_co2/mlo_in_situ_record.txt In
this page it is said that

"The "detrended" data is seasonally adjusted by removing a 4-harmonic
fit with a linear gain factor. The "fit" is based on a stiff spline
plus 4-harmonic functions with linear gain."

1. Is detrending fitting a line y = ax + b to data and then subtracting
this line from data?
2. What does "removing a 4-harmonic fit with a linear gain factor"
mean? Has this something to do with Fourier analysis?

-PJ

.

Relevant Pages

  • Re: Deseasonalization and detrending of Keeling curve
    ... David Winsemius wrote: ... 4-harmonic fit with a linear gain factor. ... What does "removing a 4-harmonic fit with a linear gain factor" ... "The number of harmonics refers to a portion of the fitting function ...
    (sci.stat.math)
  • Re: Deseasonalization and detrending of Keeling curve
    ... The "fit" is based on a stiff spline ... What does "removing a 4-harmonic fit with a linear gain factor" ... "The number of harmonics refers to a portion of the fitting function which ... involves sinusoidal terms with a fundamental period of one year plus higher ...
    (sci.stat.math)
  • Re: Deseasonalization and detrending of Keeling curve
    ... known as Keeling curve,http://en.wikipedia.org/wiki/Keeling_curveYou ... fit with a linear gain factor. ... The "fit" is based on a stiff spline ... I'm not familiar with the specifics (I suppose I should be, ...
    (sci.stat.math)
  • Re: The Promised land of Hawaii
    ... I had a dream that Hawaii was my ancestral Homeland.. ... I will not attack the nearest neighbor with some ... Now wouldn't it be nice if the Jews of Israel tried to fit in like that. ...
    (soc.culture.jewish)
Quantcast