Hi You have got an extensive explanation by Frede Aakmann Tøgersen. I consider it pretty strightforward and I do not have anything to add.
Do not expect that somebody can change your result, if your data does not support it. Regards Petr > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of javad bayat > Sent: Tuesday, January 07, 2014 4:24 PM > To: R-help@r-project.org > Subject: Re: [R] help > > I apologies for asking this question; > I run the codes but why all the prediction for pH in 21-25 month are so > close? > station month pH > 1 21 8.275635958 > 2 21 8.275635962 > 3 21 8.275635963 > 4 21 8.275635963 > 5 21 8.275635963 > 6 21 8.275635963 > > > > On Tue, Jan 7, 2014 at 2:12 PM, javad bayat <j.bayat...@gmail.com> > wrote: > > > Dear Pikal Petr; > > thanks for code. > > It was usefull. > > > > > > > > On Tue, Jan 7, 2014 at 11:30 AM, PIKAL Petr > <petr.pi...@precheza.cz>wrote: > > > >> Hi > >> > >> > >> > >> and what is wrong with e.g. > >> > >> > >> > >> fit <- neuralnet(pH~station+month, data=yourdata) > >> > >> > >> > >> As I said I am not an expert in neural nets but here is some > >> explanation how it works > >> > >> http://gekkoquant.com/2012/05/26/neural-networks-with-r-simple- > exampl > >> e/ > >> > >> > >> > >> based on that after fitting you could do > >> > >> > >> > >> compute(fit, testdata) > >> > >> > >> > >> where testdata shall be station and month. > >> > >> > >> > >> However for time series it can be more appropriate something like > >> ARIMA modelling. > >> > >> > >> > >> Petr > >> > >> > >> > >> *From:* javad bayat [mailto:j.bayat...@gmail.com] > >> *Sent:* Monday, January 06, 2014 5:58 PM > >> *To:* PIKAL Petr > >> *Subject:* Re: [R] help > >> > >> > >> > >> Dear Petr; > >> > >> I want to write function that: for example for pH: > >> > >> according these 20 months predict the variability of pH for next > >> month and stations. > >> > >> all best. > >> > >> > >> > >> On Mon, Jan 6, 2014 at 7:23 PM, PIKAL Petr <petr.pi...@precheza.cz> > >> wrote: > >> > >> Hi > >> can you be more specific? In what aspect those packages does not > >> comply with your data? What did you do for testing it? > >> > >> I am not an expert in neural networks but I do not see anything > which > >> prevents using your data in nnet. > >> > >> > >> Petr > >> > >> > >> > -----Original Message----- > >> > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > >> > project.org] On Behalf Of javad bayat > >> > >> > Sent: Monday, January 06, 2014 3:16 PM > >> > To: R-help@r-project.org > >> > Subject: Re: [R] help > >> > > >> > >> > Dear Petr; > >> > >> > I saw the nnet and neuralnet packag, and I cant find some thing > >> > relating with my data based on neural network. > >> > > >> > > >> > On Mon, Jan 6, 2014 at 10:55 AM, PIKAL Petr > >> > <petr.pi...@precheza.cz> > >> > wrote: > >> > > >> > > Hi > >> > > > >> > > Why you did not use dput for sending data? It is far better than > >> > > picture, which can not be used without retyping. > >> > > > >> > > Redarding neural network, did you try e.g. nnet or neuralnet > package. > >> > > > >> > > Petr > >> > > > >> > > > -----Original Message----- > >> > > > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > >> > > > project.org] On Behalf Of javad bayat > >> > > > Sent: Monday, January 06, 2014 7:37 AM > >> > > > To: R-help@r-project.org > >> > > > Subject: Re: [R] help > >> > > > > >> > > > Dear all; > >> > > > many thanks for your answers. > >> > > > Hear is my data (not all row: the station was 8 station at 20 > >> > month) > >> > > > which I forward it as image. I hope some one can help me to do > >> > > > Neural network for prediction of next month. > >> > > > many thanks. > >> > > > all bests. > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > -- > >> > > > Best Regards > >> > > > Javad Bayat > >> > > > M.Sc. Environment Engineering > >> > > > Shahid Beheshti (National) University (SBU) Alternative Mail: > >> > > > bayat...@yahoo.com > >> > > > >> > > >> > > >> > > >> > -- > >> > Best Regards > >> > Javad Bayat > >> > M.Sc. Environment Engineering > >> > Shahid Beheshti (National) University (SBU) Alternative Mail: > >> > bayat...@yahoo.com > >> > > >> > >> > [[alternative HTML version deleted]] > >> > >> > > >> > ______________________________________________ > >> > R-help@r-project.org mailing list > >> > 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. > >> > >> > >> > >> > >> > >> -- > >> > >> Best Regards > >> Javad Bayat > >> M.Sc. Environment Engineering > >> Shahid Beheshti (National) University (SBU) Alternative Mail: > >> bayat...@yahoo.com > >> > > > > > > > > -- > > Best Regards > > Javad Bayat > > M.Sc. Environment Engineering > > Shahid Beheshti (National) University (SBU) Alternative Mail: > > bayat...@yahoo.com > > > > > > -- > Best Regards > Javad Bayat > M.Sc. Environment Engineering > Shahid Beheshti (National) University (SBU) Alternative Mail: > bayat...@yahoo.com > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > 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 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.
