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
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 <lvest09 at 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 at 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.
Hi Livia,>From your description, it sounds like the "time" variable is actuallya vector of date strings like "30/04/2015". These will usually be input as "factors" in R, meaning that you probably had a very large number of categorical values instead of numeric. To find out, do this: is.factor(time_variable) where "time_variable" is something like mydata$Time. If the answer is TRUE, convert that variable to a vector of dates with as.Date and try your analysis again. Jim On Thu, Apr 30, 2015 at 4:25 AM, Boris Steipe <boris.steipe at utoronto.ca> wrote:> 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 <lvest09 at 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 at 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 at 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.
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.steipe at 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 <lvest09 at 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 at 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.