On Tue, Sep 30, 2008 at 4:37 PM, Anne Archibald <peridot.faceted@gmail.com>wrote:
Hello,
I have some XY data. I would like to generate the equations for an upper and lower envelope that excludes a percentage of the data points.
I would like to define the slope of the envelope line (say 3) and then have my code find the intercept that fits my requirements (say 5% of data below
lower envelope). This would then give me the equation and I could plot
2008/9/30 bevan <bevan07@gmail.com>: the the
upper and lower envelopes.
I hope this makes sense. Thanks for any help.
For this particular problem - where you know the slope - it's not too hard. If the slope is b, and your points are x and y, compute y-b*x, then sort that array, and choose the 5th and 95th percentile values.
That's a pretty elegant solution. Thanks for sharing, David
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