nonlinear

  1. N

    Nonlinear odds-to-probs conversion

    The New England Patriots are playing the Buffalo Bills. The fractional odds are Patriots 1/2 and the Bills 2/1, where a bet on the Patriots risks $2 to win $1, and a bet on the Bills risks $1 to win $2. A rational bettor has $1 to bet. A $1 wager on the favorite Patriots yields a $0.50 profit...
  2. A

    Spearman's rho or no? is one of my datasets non-monotonic?

    Hi, I'm dyslexic with limited stat education (and the internet is not helping thus far) and I'm having horrible trouble understanding what tests I can and cannot use for potentially non-monotonic data (brain, meet brick wall...). This is for my dissertation (social sciences), and I'm questioning...
  3. H

    nlme arguments explained

    Hi All, I'm trying to run an nlme on some data looking at the nonlinear response (in this case 'distance', but will also use for 'weight') of individuals ('possum') over time (repeated measures, recorded weekly for 12 weeks = 'week'). There were 3 different 'treatment' groups. Other factors...
  4. L

    Non-linear model fit

    Hi everyone. I am working on fitting a non-linear least squares model with R. My data points are virus contentration (ydata) over a timeline of 33 days (xdata). The decrease in virus concentration should be modeled with the following function: log(c/c0) = (-lambda0/alpha)*(exp(-alpha*time)-1)...
  5. G

    multiple regression if one corrleation variable is linear, other is nonlinear

    Hello, I am working on soil biology. I have a data set of soil CO2 emissions (dependant variable), with a number of other measured variables (independents). I expect that one of the independant variables (A) is a straight linear relationship. But expect that another variable (B), is some...
  6. M

    Likelihood ratio test on Nonlinear regression done manually. Possible or typo?

    Dear all, this forum is great! If I knew about it before, my studies would have been much more enjoyable. Anyways, right now I’m looking at past exams of my advanced econometrics course; I’ve been trying for two days now to solve this exercise, advanced text books at hand and constantly on...
  7. X

    Linear regression

    Little help please: A golf club manufacturer is trying to determine how the price of a set of clubs affects the demand for clubs. Below contains the price of a set of clubs and the monthly sales. a) Assume the only factor influencing monthly sales is price. Fit the following three...
  8. J

    Nonlinear Panel Regression in R

    Hello World. I have a micro data set for my local CPI basket structured as (panel data with varying monthly periods over set products) in Eviews. I however, need to run a Logit model on a number of covariates which include a set of dummies. Eviews is limited in this regard (in that it cannot...
  9. D

    Calculating confidence bands for nonlinear regression

    Hi, I am trying to find a way to calculate the 95% confidence bands for nonlinear regression. I have found the following text on the web, but I do not understand it well. "First, let's define G|x, which is the gradient of the parameters at a particular value of X and using all the...
  10. D

    Std Error of nonlinear regression coefficients

    Hi There, I have a commercial NET dll computing nonlinear regression coefficients and their sigma values. However, I would like to compute the confidence interval for each coefficient. I believe that I need to compute first the standard error for each coefficient, but if I use...
  11. A

    Help Non linear Growth Models - Derivates

    Hi!!! im amateur in mathemathicals growth models but im doing my graduated work in adjust five differents models in some growth parameters in onion, So my doubt is basically in a derivate for gauss model, i cant derivate this model and it had been adjust for some parameters. So i need to...