[R] help w/ nonlinear regression

2007-06-19 Thread Eduardo Esteves
Dear All, I'd like to fit a kind of logistic model to small data-set using nonlinear least-squares regression. A transcript of R-script are reproduced below. Estimated B and T (the model's coeff, herein B=-8,50 and T=5,46) seem appropriate (at least visually) but are quite diff from those

Re: [R] help w/ nonlinear regression

2007-06-19 Thread S Ellison
Your B coefficient differs by a suspicious-looking factor of 2.30... (ln(10). Does SPSS log() mean log10 or ln? R log(x) uses ln(x). S Eduardo Esteves [EMAIL PROTECTED] 19/06/2007 17:19:35 Dear All, I'd like to fit a kind of logistic model to small data-set using nonlinear least-squares