For the sake ofsimplicity, I use my example to explain what I have written:
nutrient<-lm(nitrate~0.9*fertilizer-0.02*flowrate+0.5*rain)
datafram=data1
Change the value offertelizer--à datafram=data2
predict(lm(nitrate~0.9*fertilizer2-0.02*flowrate+0.5*rain), datafram=data2
Is that better now?
From: Bert Gunter <bgunter.4...@gmail.com>
To: rezvan hatami <rezvan.hatami_...@yahoo.com>
Cc: "r-help@r-project.org" <r-help@r-project.org>
Sent: Monday, 27 June 2016, 10:34
Subject: Re: [R] Fw: How I can calculate the value of response variable
Is this homework? This list tries to enforce a no homework policy...
If not, it looks to me as if you have made no effort to learn R nor
have you read and followed the posting guide. We generally expect
posters to have made reasonable efforts to do both and demonstrate
what they have tried and how it has failed.
Cheers,
Bert Gunter
Bert Gunter
"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Sun, Jun 26, 2016 at 5:22 PM, rezvan hatami via R-help
<r-help@r-project.org> wrote:
>
>
>
> ----- Forwarded Message -----
> From: rezvan hatami <rezvan.hatami_...@yahoo.com>
> To: David Winsemius <dwinsem...@comcast.net>
> Sent: Monday, 27 June 2016, 9:44
> Subject: Re: [R] How I can calculate the value of response variable
>
> Dear DavidThank you for your answer. My equation is:
> nitrate=0.9*fertilizer-0.02*flowrate+0.5*rain
> my matrix:
> | season | site | nitrate | fertilizer1 | flow rate |
> | spring | site1 | 0.2 | 2 | 1 |
> | spring | site2 | 1.2 | 3 | 1 |
> | spring | site3 | 2.2 | 5 | 2 |
> | summer | site1 | 3.2 | 1 | 2 |
> | summer | site2 | 4.2 | 2 | 2 |
> | summer | site3 | 5.2 | 3 | 2 |
> | fall | site1 | 6.2 | 4 | 3 |
> | fall | site2 | 7.2 | 5 | 3 |
> | fall | site3 | 8.2 | 6 | 3 |
> | winter | site1 | 9.2 | 4 | 4 |
> | winter | site2 | 10.2 | 8 | 4 |
> | winter | site3 | 11.2 | 9 | 4 |
>
>
> I would like to know, what will be the values for variable "nitrate" if I
> divide the values of fertilizer by half and change the equation to:
> nitrate=0.9*fertilizer2-0.02*flowrate+0.5*rain
>
> in a matrix like:
>
> | season | site | nitrate | fertilizer2 | flow rate |
> | spring | site1 | 0.2 | 1 | 1 |
> | spring | site2 | 1.2 | 1.5 | 1 |
> | spring | site3 | 2.2 | 2.5 | 2 |
> | summer | site1 | 3.2 | 0.5 | 2 |
> | summer | site2 | 4.2 | 1 | 2 |
> | summer | site3 | 5.2 | 1.5 | 2 |
> | fall | site1 | 6.2 | 2 | 3 |
> | fall | site2 | 7.2 | 2.5 | 3 |
> | fall | site3 | 8.2 | 3 | 3 |
> | winter | site1 | 9.2 | 2 | 4 |
> | winter | site2 | 10.2 | 4 | 4 |
> | winter | site3 | 11.2 | 4.5 | 4 |
>
>
> Would you please tell me how I can do this in R?
> Cheers
> Rezvan
> From: David Winsemius <dwinsem...@comcast.net>
> To: rezvan hatami <rezvan.hatami_...@yahoo.com>
> Cc: "r-help@r-project.org" <r-help@r-project.org>
> Sent: Monday, 27 June 2016, 1:20
> Subject: Re: [R] How I can calculate the value of response variable
>
>
>> On Jun 26, 2016, at 3:23 AM, rezvan hatami via R-help <r-help@r-project.org>
>> wrote:
>>
>> How I can calculate the value of response variable in a linear model of a
>>matrix of several variables?Can somebody please answer me?
>>
>
> You should explain in more detail why the answer to this question is not
>just the `lm` function. See:
>
> ?lm
> ?predict.lm
>
> That would deliver (after suitable invocation of the `predict` function)
>not be the "value of the response variable" (since that would just be the
>values in your data), but rather the conditional expectation of the response
>variable given the values of the predictors.
>
>
>>
>> Cheers
>> Rezvan Hatami
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> 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.
>
> David Winsemius
> Alameda, CA, USA
>
>
>
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> 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.
[[alternative HTML version deleted]]
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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