Two-Lines test of U-Shaped Relationships


Overview.

This app runs the u-shape test introduced by Simonsohn (2016 .pdf).
It estimates an interrupted regression, that is, a regression with two separate slopes, for the predictor hypothesized to have a u-shaped effect. If both slopes have opposite sign, and are individually statistically significant, the test rejects the null hypothesis that there is no u-shaped (nor inverted u-shaped) effect.

****IMPORTANT - THE APP IS IN ALPHA TESTING WHILE THE PAPER IS BEING REVIEWED, PLEAES CONTACT URI (uri.sohn@gmail.com) IF USING FOR ANALYSES TO BE SHARED WITH OTHERS, DEBUGGING HAS NOT YET OCURRED

Instructions.

1. Upload the data
2. Type in the regression you want to run (e.g., what to control for)
3. Click Run button