Linear and quadratic contrasts with unequally spaced treatments
I am using the contrasts specification window with + and - buttons. However, when treatments are unequally spaced, the simple + and - isn't working. Here's my specific example: Treatment doses: 0, 1, 2, 4 These doses are NOT equally spaced so we can not use the typical 4 level linear and quadratic contrasts. I calculated appropriate coefficients as shows in this link. https://real-statistics.com...