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I am trying to calculate mean preschool enrolment in each class, excluding the index child. I am using the command

series meanenrol= @meansby(preschool, t2_id, "@all")

t2_id is the teacher id which identifies the class and this is working fine to give me the average for the class but I want the average for the class excluding the observation child. Does anybody have any idea how I can do this? Thanks in advance.

Thanks but that didn't work, gave me negative numbers. If it helps preschool is a dummy variable.

Oops, I misunderstood what you want. Maybe something like

Brilliant! That worked perfectly. Thank you so much!