st: Confidence Intervals plot

[Xavi Barber <xavi.barber@terra.es>]

I have two variables A and B (continuous), and C (Yes o No variable)

I'd like to have a plot with the Confidence Intervals plot for A in 
quintiles of B by C

I tried  a lot of plots commands, probably I'm a very bad graphs user, but 
I didn't find it.
ciplot  and variants
ecplot
....

Can you help me?

Thanks

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