I believe something like:

scatter.smooth(est.prob, as.numeric(y == "level of interest"))

would be close.  You may want to use a larger span than default.

Andy 

From: abbas tavassoli
> 
> Hi, 
> I have a binary variable and corresponding predicted 
> probability (using 
> logistic regression on some explanatoey variables); 
> I want to check that the model is well-calibrated using a 
> calibration plot.
> how can I have the calibration plot for my data?
> thanks.
> 
> 
> 
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