non-linearity

  1. S

    Continuous by contiuous interaction and non-linearity in OLS

    To whom it may concern: I am conducting an OLS for a class assignment and have an interaction between ADHD and non-delinquent peers. I have tested for the assumption of linearity and it is violated for the non-delinquent peers measure. I spoke with my professor about what to do, but it...
  2. C

    Not Quite Quadratic Regression

    Hello all, I predict an u-shaped relation between two variables, y and x. If I perform a quadratic linear regression, i.e. use a model like y = b1 + b2x + b3x^2 + error, then the coefficients b2 and b3 are not significant. However, if I change the exponent to something less than 2, e.g...