JASP and inverted-U polynomial contrasts?
Hello everyone 👋😊
I am trying to use polynomial (quadratic) contrasts to find if my data follow an inverted U-shaped distribution using JASP. However, every paper I find on quadratic contrasts gives the coefficient used to find a U shaped distribution, and nothing on inverted-Us. I tried using a customized contrast, but it only gives an error message.
Does anyone know if JASP automatically tests for invterted-U shapes in the quadratic contrast ?