[R] R exponential regression

[chrisli1223]

Thank you very much Murray! Greatly appreciated. :]

Chris

Murray Cooper wrote:
> 
> Chris,
> 
> I haven't seen anyone post a reply yet so thought I'd
> throw in my thoughts. I'm no R expert!
> 
> When you talk about an exponential trend line are you
> refering to:
> 
> 1)  y=ax^b
> or
> 2) y=ae^(bx)
> 
> If 1) then take base10 logs of y and x and then fit them
> with simple linear regression. Then calculate the antilog
> of the residulas and plot these as your trendline.
> 
> If 2) then take natural logs of y and x and follow the rest
> of the procedure described in 1).
> 
> Hope this helps.
> 
> Murray M Cooper, Ph.D.
> Richland Statistics
> 9800 N 24th St
> Richland, MI, USA 49083
> Mail: richstat at earthlink.net
> 
> ----- Original Message ----- 
> From: "chrisli1223" <chrisli at austwaterenv.com.au>
> To: <r-help at r-project.org>
> Sent: Thursday, January 07, 2010 10:33 PM
> Subject: [R] R exponential regression
> 
> 
>>
>> Hi all,
>>
>> I have a dataset which consists of 2 columns. I'd like to plot them on a 
>> x-y
>> scatter plot and fit an exponential trendline. I'd like R to determine
>> the
>> equation for the trendline and display it on the graph.
>>
>> Since I am new to R (and statistics), any advice on how to achieve this 
>> will
>> be greatly appreciated.
>>
>> Many thanks,
>> Chris
>> -- 
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> 
> ______________________________________________
> R-help at 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.
> 
> 

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