Here is one way to get what you want
names default to here(1);
dt4=current data table();
dt5 = dt4 << Summary(
Group( :Y Intercept ),
Sum( :Aging Rate ),
Subgroup( :Batch No Intercept ),
Freq( "None" ),
Weight( "None" ),
statistics column name format( "column" ),
Link to original data table( 0 )
);
dt5 << delete columns( "N Rows");
for(i=1,i<=N Cols(dt5),i++,
if(word(1,as column(dt5,i)<<get name,"(),") == "Aging Rate",
column(dt5,i) << set name(word(2,as column(dt5,i)<<get name,"(),")))
);
Using the Summary Platform automatically produces a data table as the output.
Jim