It works for me. Are sure you have the latest version of ggplot2?
Downloaded ggplot2 within the past 2 weeks. I THINK the error may be caused when one of the Type's only has one record, thus not allowing loess() or lm() to compute properly. Computing testFrame as below illustrates that.
TestFrame – Jared Jun 2 '10 at 3:43 That data set still works for me. – hadley Jun 10 '10 at 14:13.
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