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 ?
Thank you!
Comments
I do not immediately see how a quadratic contrast would be set up to find a U but not an inverted U. You could try generating data according to an inverted U (or take U-shaped data and transform it to give an inverted U shape), apply the software, and see whether you recover what you put in.
Cheers,
E.J.
I played around by creating data and indeed, it does work, thank you!