I have got the following statement:

*> overview.domains$sample.var <- aggregate(migr$amigo.migr,
by=list(siruta=amigo$siruta), var)[,-1]/overview.domains$n.i.*
*Error in migr$amigo.migr : $ operator is invalid for atomic vectors*


What should i do to solve this error?


Thank you.

Kind regards,
Ana Maria Dobre

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