Remove the
unit areas from the AFRICA data set. DATA= specifies the input map
data set and OUT= specifies the output map data set. The input map data set
has a variable called REGION that is used as the BY-variable to identify the
new unit areas. The ID statement specifies the current unit areas from the
input map data set.
proc gremove data=newaf out=reflib.africa;
by region;
id id;
run;