[R] double exponential regression R

[Jose Iparraguirre]

Dear Catalin,

I think the package dcemriS4 has this capability.
Hope it helps,
Jose
________________________________________
From: r-help-bounces at r-project.org [r-help-bounces at r-project.org] On Behalf Of catalin roibu [catalinroibu at gmail.com]
Sent: 21 April 2013 20:34
To: r-help at r-project.org
Subject: [R] double exponential regression R

Hello all!
I have a problem with a double exponential equation.
This are my data's> structure(list(proc = c(1870.52067384719,
766.789388745793, 358.701545859122,  237.113777545511, 43.2726259059654,
148.985133316262, 92.6242882655781,  88.4521557193262, 56.6404686159112,
27.0374477259404, 34.3347291080268,  18.3226992991316, 15.2196612445747,
5.31600719692165, 16.7015717397302,  16.3923389973684, 24.2702542054496,
21.247247993673, 18.3070717608672,  2.8811892177331, 3.18018869564679,
8.74204132937479, 7.11596966047229 ), cls = c(0.25, 0.5, 0.75, 1, 1, 1.5,
2, 2.5, 3, 3.5, 4, 4.5,  5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10)),
.Names = c("proc",  "cls"), row.names = c("0.25", "0.5", "0.75", "1", "11",
"1.5",  "2", "2.5", "3", "3.5", "4", "4.5", "5", "5.5", "6", "6.5", "7",
 "7.5", "8", "8.5", "9", "9.5", "10"), class = "data.frame")
I want to compute a double exponential equation like this:
proc=a*exp(b*class)+c*exp(d*class)

Thank you very much for your help!

Best regards!

CR
--
---
Catalin-Constantin ROIBU
Lecturer PhD, Forestry engineer
Forestry Faculty of Suceava
Str. Universitatii no. 13, Suceava, 720229, Romania
office phone     +4 0230 52 29 78, ext. 531
mobile phone   +4 0745 53 18 01
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FAX:                +4 0230 52 16 64
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