Hello guys, thanks for your quick reply I will try and specific my problem
I have over 300.000 observations for different petrol pumps in all of Denmark fra 1. november 2014 - 31 january 2015 for example I have: petrol pump number: "1111" / date: 1. november 2014 / time: 08:14:22 / price: 10.55 /day / zipcode: 2000 petrol pump number: "1111" / date: 1. november 2014 / time: 08:29:00 / price: 10.52 / day / zipcode: 2000 petrol pump number: "3456" / date: 1. november 2014 / time: 08:19:21 / price: 10.88 / day/ zipcode: 2100 And then put the zip codes into dummy categories like X1: zipcode (1000-2000)=1 all others 0 and so on. My regression model then look like lm(price, x1 + x2 + x3 ... ) but the "Multiple R-squared" is really low, 0.01217 So instead I would like to check if the time "hh:mm:ss" have an effect on the price. I know how to tell R about the date by as.Date() , but not with the time, how can I do that? Or do you guys maybe a third idea about what should make a regression about to improve the model? Cheers Livia :) ________________________________________ Fra: Boris Steipe [boris.ste...@utoronto.ca] Sendt: 29. april 2015 20:25 Til: Livia Maria Vestergaard Cc: r-help mailing list Emne: Re: [R] LM() and time in R Have a look at the help page for the function ts() (type ?ts at the R prompt). Other than that, you haven't provided nearly enough information for us to diagnose your issue. Please see here for some hints on how to ask questions productively: http://adv-r.had.co.nz/Reproducibility.html http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example Cheers B. On Apr 29, 2015, at 6:26 AM, Livia Maria Vestergaard <lves...@student.sdu.dk> wrote: > > Hello, > > I need some help with a project that I’m working one. > > Im trying to make a l regression model (lm) in r with time as independant > variable and gas prices as the depended. > But It seems like everything im trying to run it, R freeze, I think that I > need to tell R somehow that my time is time but how ? > > > > Hope that you can help me :) > Livia > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
