1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Linear and Non-Linear Regression

  1. Mar 2, 2010 #1
    1. The problem statement, all variables and given/known data
    Well I have conducted a regression analysis, and have plotted a graph of my residuals vs my input variable. I know that for a linear regression the residuals must be randomly scattered blahblah, but from this graph, it looks like it has a curve to it ? is this because I only have 10 points, or is it not linear?
    If it is not linear, where do I go from there?


    2. Relevant equations
    mm66j4.jpg


    3. The attempt at a solution
    Assuming it is not linear, I tried to do the log to the base ten of my output, and ended up with a slightly smaller value of R squared. I also tested with cubic and quadratics, they seem to have a larger value of R squared.
     
    Last edited: Mar 2, 2010
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted