linear fit

  1. S

    Defining "low-range" of a data set

    Hi all! So here is the scenario, I have a linear non-weighted calibration curve. I run a bunch of tests and gather data from which I can derive a control chart. This gives me "acceptance criteria" for a passing test, from a statistical perspective. Let's say +-20% from a known value. But this...
  2. L

    Reduced chi-squared test fit goodness

    In Origin Pro 9, I made 2 linear fits (y = kx + b). For example, I chose equation y = x + 10. In one case, I set experimental following points: x =1, y= 11 x = 2, y = 12 x = 3, y = 12.8 x = 4, y = 14.1 x = 5, y = 15 x = 6, y = 16 x = 7, y = 17.3. In another case, I set: x = 1, y = 10 x = 2, y =...