Answer by Galit for changing the coding system from helmert coding to...
After some web research, I finally found an answer. So I am answering my own question and hopefuly this will be helpful for future similar issues. I base my answer on this great explanation by Bill...
View Articlechanging the coding system from helmert coding to difference coding changes...
EDIT: I think I have mistaken the names of the coding systems, so I changed it (in bold). The content has not changed at all, though, so I would still appreciate any answer. END EDITI'm running linear...
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