Re: [R] Replicate Excel's LOGEST worksheet function in R

2010-11-15 Thread cran . 30 . miller_2555
On Sat, Nov 13, 2010 at 10:37 PM, Jeff Newmiller - jdnew...@dcn.davis.ca.us <+cran+miller_2555+a7f4a7aeab.jdnewmil#dcn.davis.ca...@spamgourmet.com>wrote: > > Anyway, I recommend you learn from David before criticizing his assistance. > > >On Fri, Nov 12, 2010 at 5:28 PM, > David Winsemius - > >d

Re: [R] Replicate Excel's LOGEST worksheet function in R

2010-11-13 Thread Jeff Newmiller
Most software for curve fitting uses linear fits in conjunction with some combination of logarithms of your original in order to obtain logarithmic, power or exponential curve fits. The nls approach is arguably more correct, but it will yield different results than "normal", and may be finicky w

Re: [R] Replicate Excel's LOGEST worksheet function in R

2010-11-13 Thread cran . 30 . miller_2555
On Nov 13, 2010, at 10:12 PM, cran.30.miller_2...@spamgourmet.com wrote: > On Fri, Nov 12, 2010 at 5:28 PM, David Winsemius - > cran.30.miller_2...@spamgourmet.com > <+cran > +miller_2555+c0e7477398.dwinsemius#comcast@spamgourmet.com> wrote: > > On Nov 12, 2010, at 5:07 PM, David Winsemiu

Re: [R] Replicate Excel's LOGEST worksheet function in R

2010-11-13 Thread cran . 30 . miller_2555
On Fri, Nov 12, 2010 at 5:28 PM, David Winsemius - dwinsem...@comcast.net <+cran+miller_2555+c0e7477398.dwinsemius#comcast@spamgourmet.com> wrote: > > On Nov 12, 2010, at 5:07 PM, David Winsemius wrote: > > >> On Nov 12, 2010, at 4:22 PM, cran.30.miller_2...@spamgourmet.com wrote: >> >> Hi -

Re: [R] Replicate Excel's LOGEST worksheet function in R

2010-11-12 Thread David Winsemius
On Nov 12, 2010, at 5:07 PM, David Winsemius wrote: On Nov 12, 2010, at 4:22 PM, cran.30.miller_2...@spamgourmet.com wrote: Hi - I have a dataframe of (x,y) values. I'd like to fit an exponential curve to the data for further statistical analysis (pretty much the same functionality

Re: [R] Replicate Excel's LOGEST worksheet function in R

2010-11-12 Thread David Winsemius
On Nov 12, 2010, at 4:22 PM, cran.30.miller_2...@spamgourmet.com wrote: Hi - I have a dataframe of (x,y) values. I'd like to fit an exponential curve to the data for further statistical analysis (pretty much the same functionality provided by Excel's LOGEST worksheet array function). C

[R] Replicate Excel's LOGEST worksheet function in R

2010-11-12 Thread cran . 30 . miller_2555
Hi - I have a dataframe of (x,y) values. I'd like to fit an exponential curve to the data for further statistical analysis (pretty much the same functionality provided by Excel's LOGEST worksheet array function). Can someone point me to the (set of) functions/ package that is best suited to p