Re: [R] Calculate Total CORRECTED SS for non linear regression

2015-09-30 Thread Jeff Newmiller
d for >linear >regression? To me it looks the same. > > > >-Ursprüngliche Nachricht- >Von: peter dalgaard [mailto:pda...@gmail.com] >Gesendet: Mittwoch, 30. September 2015 01:09 >An: Michael Eisenring >Cc: r-help@r-project.org >Betreff: Re: [R] Calculate To

Re: [R] Calculate Total CORRECTED SS for non linear regression

2015-09-30 Thread Michael Eisenring
: [R] Calculate Total CORRECTED SS for non linear regression > On 30 Sep 2015, at 02:08 , Michael Eisenring wrote: > > Can anyone tell me how to calculate the Total Corrected SS in R and > how it can be implemented in my code? It is just sum((y-mean(y))^2). Beware that a fair amount

Re: [R] Calculate Total CORRECTED SS for non linear regression

2015-09-30 Thread ProfJCNash
Some workers consider it bad practise to compute what is called R-squared for a nonlinear model. I find it useful for nonlinear models as a signpost of how good a fit has been found. But just as signposts can be turned around by vandals, nonlinear models can give a misleading indication. With linea

Re: [R] Calculate Total CORRECTED SS for non linear regression

2015-09-30 Thread peter dalgaard
> On 30 Sep 2015, at 02:08 , Michael Eisenring wrote: > > Can anyone tell me how to calculate the Total Corrected SS in R and how it > can be implemented in my code? It is just sum((y-mean(y))^2). Beware that a fair amount of (somewhat silly) contention is going on in this area, though. In pa

[R] Calculate Total CORRECTED SS for non linear regression

2015-09-29 Thread Michael Eisenring
Hello I started to work on nonlinear regressions recently, I want to compare a set of models and would like to use an equivalent of R2 for nonlinear regression models. I learned that a good alternative is to calculate the following corrected formula: 1 - (Residual SS/Total Corrected SS)