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...tion structures and it has worked fine. Does anyone know why it won't recognise ~year | id2 (or even ~ 1 | id2) as a formula? Any help would be great Pam -- Pamela A McCaskie BSc(Mathematical Sciences)(Hons) Western Australian Institute for Medical Research University of Western Australia SCGH Campus Ground Floor, B Block QE-II Medical Centre Hospital Avenue, Nedlands Western Australia 6009 AUSTRALIA Email: pmccask at cyllene.uwa.edu.au Phone: +61-8-9346 1612 Mob: 0417 926 607

...cript type I'm guessing that it's looking in the global environment for subs, but I'm not sure how to fix this. Any help would be greatly appreciated. -- Pamela A McCaskie BSc(Mathematical Sciences)(Hons) Western Australian Institute for Medical Research University of Western Australia SCGH Campus Ground Floor, B Block QE-II Medical Centre Hospital Avenue, Nedlands Western Australia 6009 AUSTRALIA Email: pmccask at cyllene.uwa.edu.au Phone: +61-8-9346 1612 Mob: 0417 926 607