The smearingEst function in the Hmisc package, given a set of residuals, can
compute the smearing estimator of the mean.  To get the confidence interval
for the mean or difference in the mean will take some work (unless you have
no covariates to adjust for; in that case you can just bootstrap the
original data install of using the gamma model).  See the Hmisc function
areg.boot and associated functions for example code.

Frank

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Frank Harrell
Department of Biostatistics, Vanderbilt University
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