Did you perhaps accidentally include your response as a predictor? > On Jun 15, 2017, at 12:48 PM, lily li <chocol...@gmail.com> wrote: > > Thanks for your replies. I tried the regression, but then got a NA value > for the slope. And here is the error message: > Coefficients: (1 not defined because of singularities) > > > On Thu, Jun 15, 2017 at 12:20 AM, PIKAL Petr <petr.pi...@precheza.cz> wrote: > >> Hi >> >> But X can be some function like - sin, cos, log, exp... >> >> Cheers >> Petr >> >>> -----Original Message----- >>> From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of lily li >>> Sent: Thursday, June 15, 2017 1:28 AM >>> To: MacQueen, Don <macque...@llnl.gov> >>> Cc: R mailing list <r-help@r-project.org> >>> Subject: Re: [R] about fitting a regression line >>> >>> Thanks. I thought lm() function is for linear model, such as the >> correlation >>> below: >>> Y= aX + b >>> >>> On Wed, Jun 14, 2017 at 5:25 PM, MacQueen, Don <macque...@llnl.gov> >>> wrote: >>> >>>> Start with the lm() function; i.e., see >>>> >>>> ?lm >>>> >>>> -Don >>>> >>>> -- >>>> Don MacQueen >>>> >>>> Lawrence Livermore National Laboratory >>>> 7000 East Ave., L-627 >>>> Livermore, CA 94550 >>>> 925-423-1062 >>>> >>>> >>>> On 6/14/17, 3:40 PM, "R-help on behalf of lily li" < >>>> r-help-boun...@r-project.org on behalf of chocol...@gmail.com> wrote: >>>> >>>> Hi R users, >>>> >>>> I have some data points (Xi, Yi), and they may follow such a >>>> pattern Yi = >>>> cCOS(Xi) + d, how to find the c and d in R? which function to use? >>>> Also, >>>> how to get the R2 and p value for this correlation? 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______________________________________________ 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.
