search for: ppmv

...ing something like: file<-read.csv("co2data.csv") names(file) attach(file) fit<-lm(co2~1+time+I(time^2)+sin(2*pi*time)+cos(2*pi*time)+sin(4*pi*time)+cos(4*pi*time)+ sin(6*pi*time)+cos(6*pi*time)+sin(8*pi*time)+cos(8*pi*time),data=file) fit$residuals # variable 'co2' is in ppmv and variable 'time' is in the form of decimal time. The problem is: when I plot above residuals vs. time, it still shows some seasonal cycle with time. SO, I doubt that I am doing something wrong. Kindly help, how to fit correctly, a fourth harmonic function on CO2 which is varying with v...

...essage-ID: <AANLkTind3+hs91==Te155AvYTBB4o4XULE=mEfWTAFwx at mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" Dear R Users, I have trend of two time series of CO2 each 10 years of data. One is varying weekly and another is bi-weekly. I want to calculate Growth rate ppmv / year of these CO2 trends. Therefore I want to calculate time derivative ppmv / year. How to do it in R? Here I attached example data file, I would appreciate if any one kindly can help on it. Thanks, Regards, Yogesh -------------- next part -------------- 1993.1218 356.8655 1993.1246 356.872...