Knut,

With the assumption that you are asking about Fisher's LSD for all pairwise
contrasts in ANOVA,
then it is available, along with many superior tests, in the multcomp
package in R.
See ?glht.

Since you mention Excel, please look at RExcel, a package which seamlessly
merges
R and Excel.  Any R function can be accessed through Excel and can be placed
inside
the Excel automatic recalculation model.  The Rcmdr menu has been placed on
the
Excel menu bar.  See rcom.univie.ac.at for full information.
You can install RExcel on Windows from CRAN with
     install.packages("RExcelInstaller")

For this example, the Tukey comparisons from glht in R are on the Rcmdr menu
and
hence are available to the Excel user with just a few clicks.

Rich

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