Plotting a line which would include 95% of points above and below the regression line

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Tushar Agarwal
Tushar Agarwal 2016-11-14
评论： Tushar Agarwal 2016-11-15
Hello,
I have used the segmented regression method to plot linear lines over my scatter plot. Now I want to draw a line parallel to the segmented regression line, both above and below (+ & -), which would include approximately 90-95% of the points.
Can anybody help me with this? thank you

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Ahmet Cecen
Ahmet Cecen 2016-11-14
Find your residual vector.
Use prctile() on the residual vector to find the points at your upper and lower bounds.
Solve the equation BoundY = Slope*BoundX + Location, for Location.
Plot the lines with both the upper and lower bound Locations.
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Ahmet Cecen
Ahmet Cecen 2016-11-14
Well you in the end, you should have a function as a result of your regression in the form:
Yestimate = f(variables);
Residuals are simply:
Yactual - Ytraining
Then you can find the value at which the residuals are bigger than a certain value using prctile(Residuals,percentilevalue).
Now you can find the index of the yactual at which you observe that residual, then plot a line through it to achieve the desired effect.

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