Have a look at 25556 - Use PROC GMAP with the ODS HTML statement to create a drill down map for the web. There are numerous papers available, google advanced search: site:sas.com map "drill-down". ... View more

Richard, I can't say one way or the other as I don't think I was even aware of the retain statement's existence until the late 90s.  Since then, at least, I think it has 'retained' its current behavior.  I've always wished that SAS would include a reorder statement, so that new users can accomplish variable reordering without first having the understand what the retain statement is really doing. ... View more

Your example data does not exactly go with your description but perhaps this will get the discussion started. data soda;    infile cards missover;    input soda fizz @;    do while(not missing(fizz));       output;       input fizz @;       end;    cards; 1  2.0  2.8  3.3  3.2  4.4  3.6  1.9  3.3  2.8  1.1  2  3.5  2.8  3.2  3.5  2.3  2.4  2.0  1.6 3  3.3  3.6  2.6  3.1  3.2  3.3  2.9  3.4  3.2  3.2 4  3.2  3.3  3.2  2.9  3.3  2.5  2.6  2.8 5  2.6  2.6  2.9  2.0  2.0  2.1 ;;;;    run; proc print;    run; proc glm;    class soda;    model fizz = soda;    run; ... View more