Can 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?
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I 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?
I 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.