we want to use an numeric/ordinal column and a numeric/continuous column to populate a vertical bar chart, with the former on the x axis and latter on the y axis

this is amazingly easy in jmp, done in 20 seconds

now we want to fit a regression line to the tops of the bars, ie the data

this is amazingly hard in jmp, cant figure it out -- has to do with the ordinal data on the x axis, but... does this mean it's impossible?

help? thanks