Confidence interval?

Thomas Seth Davis <Thomas.Davis <at> nau.edu> writes:

 I need help fitting/plotting a confidence interval to a frequency

distribution....

In many medical journals, reviewers only want to see some error bars.
In 90% of the cases, these are wrong or misleading, but it is hopeless
to argue with medical professors playing statisticians. So I give them
the square-root of the counts, which is not much worse than anything else,
but I do not claim these to be confidence intervals.
Have some good excuse ready when some counts are low.

If you are working in a more serious field, you might consider giving
something like estimates of the parameters, but you cannot plot these
in your curves easily. Try fitdistr in package MASS for a starter.

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Dieter