|Dec18-12, 07:58 PM||#18|
Factorising a quadratic?
well, I don't need any measurements below 107 steps!!!
I will look into using a linear model...
thanks for your help
|Dec18-12, 08:22 PM||#19|
The ordered pairs shown in your FinalCurve_Obj.jpg image attachment can be plotted onto a cartesian coordinate system, and a best line can be drawn. Any points on the line can be used for finding slope, and several points can be used for finding a y-intercept, an average of these taken, and then this can be used as the best y-intercept. I tried this and found a line to fit as
Similar to what you said, near x=148 and x=158, the resulting y deviates about 3 inches from what you expected. Much of the rest of the line is a very good fit.
|Dec19-12, 06:54 AM||#20|
Careful with mixing relative and absolute error, the value for 112 steps has a larger relative error.
I agree that 2-3 inch are a reasonable value for a maximal error (not including possible measurement uncertainties), but the relative error can be large for small values in column L.
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