[R] Collapsing levels of categorical variables

[Saeed Abu Nimeh]

In this paper [1] the author mentioned a procedure by M. Greenace that
can be used to collapse the levels of a categorical variable by
setting up a
table with the frequency of each level and the proportion of the
target value in each level. Then collapsing the table
level by level looking at the change in chi-square as the table is
collapsed. Does anyone know if such a procedure is available in R.

[1] http://www2.sas.com/proceedings/sugi31/079-31.pdf