Hello forum members, I am taking this R course which I have to admit that it is beyond my capability. I am asked to analyze the following data(file attached) according to the question provided below: 1. The file [data_13-9.txt] contains a data of length 225, which seems to have some cycle pattern. (1) Fit a suitable model for this data, then report the model equation. (2) Provide the forecast values for 3-steps ahead and 6-steps ahead. I am desperately seeking for your help, since I really don't know where to start.. I have done "plot.ts(data.13-6)", but not further. Above question is just part of the whole task, but I believe solving this would be very much helpful for me to jump in to the other questions. It would be easier for me to follow if your answer is in R script.. I appreciate your patience and help. Thank you so much in advance! Cheers, Lia -------------- next part -------------- fourth_a.ts 1 -0.0242227774450564 2 0.447778425867187 3 0.0679634009051251 4 0.390085614914361 5 0.249535226083153 6 0.518797872921499 7 -0.0969256279112136 8 0.123337983703432 9 -0.414941322119016 10 -0.27757276812968 11 0.0403939285820523 12 0.494211788018315 13 0.124244228153442 14 0.394493565117432 15 0.188705401390586 16 0.532762644104765 17 -0.10747895472636 18 0.144164346660537 19 -0.336048738751554 20 -0.268668787023198 21 0.0632175364558109 22 0.425890066866375 23 0.129576388534439 24 0.434428059119178 25 0.166373082777172 26 0.500324747168639 27 -0.181757008467706 28 0.111908426500126 29 -0.271053619415509 30 -0.167744715393572 31 -0.0338728333227656 32 0.333625139545928 33 0.0140758980245519 34 0.357007127635719 35 0.117528321727847 36 0.436606929603184 37 -0.281483140210634 38 0.0207127868483681 39 -0.347869271054934 40 -0.173998579595848 41 -0.0799206011874377 42 0.277044216890528 43 -0.114919716596858 44 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Sorry Lia. We don't do homework on this list. You can imagine how clogged it would be if we did. Maybe you'll get lucky and someone will answer you privately. Otherwise, seek help from your teachers, fellow students, and/or course homework forums. Cheers, Bert Bert Gunter "Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." -- Clifford Stoll On Fri, Jul 10, 2015 at 2:17 AM, Lia LEE <ljylia.0101 at gmail.com> wrote:> Hello forum members, > > I am taking this R course which I have to admit that it is beyond my > capability. I am asked to analyze the following data(file attached) according > to the question provided below: > > 1. The file [data_13-9.txt] contains a data of length 225, which seems to > have some cycle pattern. > (1) Fit a suitable model for this data, then report the model equation. > (2) Provide the forecast values for 3-steps ahead and 6-steps ahead. > > I am desperately seeking for your help, since I really don't know where to > start.. I have done "plot.ts(data.13-6)", but not further. Above question > is just part of the whole task, but I believe solving this would be very > much helpful for me to jump in to the other questions. It would be easier > for me to follow if your answer is in R script.. > I appreciate your patience and help. > Thank you so much in advance! > > Cheers, > Lia > > ______________________________________________ > 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.
On 10/07/15 21:17, Lia LEE wrote:> Hello forum members, > > I am taking this R course which I have to admit that it is beyond my > capability. I am asked to analyze the following data(file attached) according > to the question provided below: > > 1. The file [data_13-9.txt] contains a data of length 225, which seems to > have some cycle pattern. > (1) Fit a suitable model for this data, then report the model equation. > (2) Provide the forecast values for 3-steps ahead and 6-steps ahead. > > I am desperately seeking for your help, since I really don't know where to > start.. I have done "plot.ts(data.13-6)", but not further. Above question > is just part of the whole task, but I believe solving this would be very > much helpful for me to jump in to the other questions. It would be easier > for me to follow if your answer is in R script.. > I appreciate your patience and help. > Thank you so much in advance!As Bert Gunter said, we don't do homework for people on this list. Notwithstanding I couldn't resist having a crack at analysing your time series, and I found it, uh, challenging to say the least. I think of myself as having at least *some* skill at fitting time series models, and I struggled to find a model that fitted adequately to your data. (I finally managed to get a decent fit, after trying a number of models on a hammer-and-hope basis.) Perhaps I am even more of a thicko than I think I am. Nevertheless it seems to me that your instructor has dropped you in the deep end by setting you this exercise. (Perhaps I am missing something obvious, as is so often the case. Others may wish to chime in with some comments to the effect "You idiot Rolf. The *obvious* model is ....") At any rate, your first stop should be your instructor. Get him or her to give you some pointers as to how to get started. That is what instructors are for. cheers, Rolf Turner Technical Editor ANZJS Department of Statistics University of Auckland Phone: +64-9-373-7599 ext. 88276
I was under the impression that different instructional environments have
different standards for ethical conduct, so we list members cannot in general
know whether we would be condoning/assisting in cheating. However, if you are
taking a class, then the instructor/institution should be providing appropriate
resources to assist the student so we should not have to second guess them
anyway. Reducing list volume is at best a secondary concern from my perspective.
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On July 10, 2015 10:30:41 AM PDT, Bert Gunter <bgunter.4567 at gmail.com>
wrote:>Sorry Lia. We don't do homework on this list. You can imagine how
>clogged it would be if we did.
>
>Maybe you'll get lucky and someone will answer you privately.
>Otherwise, seek help from your teachers, fellow students, and/or
>course homework forums.
>
>Cheers,
>Bert
>
>
>Bert Gunter
>
>"Data is not information. Information is not knowledge. And knowledge
>is certainly not wisdom."
> -- Clifford Stoll
>
>
>On Fri, Jul 10, 2015 at 2:17 AM, Lia LEE <ljylia.0101 at gmail.com>
wrote:
>> Hello forum members,
>>
>> I am taking this R course which I have to admit that it is beyond my
>> capability. I am asked to analyze the following data(file attached)
>according
>> to the question provided below:
>>
>> 1. The file [data_13-9.txt] contains a data of length 225, which
>seems to
>> have some cycle pattern.
>> (1) Fit a suitable model for this data, then report the model
>equation.
>> (2) Provide the forecast values for 3-steps ahead and 6-steps ahead.
>>
>> I am desperately seeking for your help, since I really don't know
>where to
>> start.. I have done "plot.ts(data.13-6)", but not further.
Above
>question
>> is just part of the whole task, but I believe solving this would be
>very
>> much helpful for me to jump in to the other questions. It would be
>easier
>> for me to follow if your answer is in R script..
>> I appreciate your patience and help.
>> Thank you so much in advance!
>>
>> Cheers,
>> Lia
>>
>> ______________________________________________
>> 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.