How is the Smooth Line in the Graph Builder determinedCan anyone tell me how the smooth line is generated in the Graph Builder? I assume is some sort of running average, but anyone know how many values or what range its pulling to make the average?
Re: The Smooth Line in the Graph BuilderHi,
Is there a way to extract the equations of the smoothed curves ?
Thanks
Re: The Smooth Line in the Graph Builder@samir here are two posts on cubic splines.
this one is probably what you want (thanks @Duane_Hayes
this one shows another way to get the coefficients; I used the smoothed spline values to control the color.
Re: The Smooth Line in the Graph BuilderThanks @Craige_Hales,
It is very clear 
The mystery around Spline is gone !
Thanks.
Re: The Smooth Line in the Graph BuilderI can make sense in cases like this where the response has two levels and the factor is ordinal. In that case, the Y reflects the proportion of the two values and you get of the trend for how that proportion changes with the GPA. Your "Missing" value on the X axis, however, is categorically different and should be plotted separately.
A more common view for categorical data would be a stacked bar of the counts or proportions for each outcome for each GPA value.
Re: The Smooth Line in the Graph BuilderThank you very much for your prompt reply and heartening answer.
Re: The Smooth Line in the Graph BuilderI see the option of cubic splines is available in JMP at graph builder with categorical variables. For example, when you test the moderating(interacting) effect of a categorical variable on the effect of a categorical variable to a categorical outcome. Does this make sense? Is that possible?
Re: The Smooth Line in the Graph Builder@mpb, thanks for this info. This is very useful.
Another question, is there a way to disable "Standardize X" in Graph Builder? In Bivariate, there is a checkbox to enable/disable "Standardize X". I thought Graph Builder might have that too, but I can't find it.
Thanks,
Shaira
