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Testing gradient against a value

  1. Apr 18, 2008 #1
    1. The problem statement, all variables and given/known data
    I have 25 pairs of values. I have a gradient and want to test if this gradient is significantly different from 1. Which stats test do I use? I thought of using a one-sample t-test, but how are you meant to put 25 gradients in the test!??? thanks...
  2. jcsd
  3. Apr 18, 2008 #2
    Why are there 25 gradients? If you have 25 pairs of values (all presumably obtained from the same experiment), you would normally put these pairs of values into a least-squares fitting algorithm to find the most suitable gradient and its error.

    If you google "JLineFit" you'll find a program that can do this for you.

    In its simplest form, you could assume it's signficantly different if the value and error on the gradient doesn't span a range encompassing a value of 1.
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