From: Severino on
I have 11 different progressing tree ages measured on 5 different sampling periods. Tree ages were classified as either: young, intermediate, mature or natural. Two of the tree age were damaged by a typhoon and were coded as 0 (undamaged) and 1 (damaged).

I want to do 1- or 2-way repeated measures Analysis of Covariance. But I am having problem on setting groups.

Any advise how to do repeated measures ANCOVA will be greatly appreciated. Thank you very much.