Beta of 0 and p-value of 1


I am estimating a 2 stages least squares model. My first stage is fine ( strong instrument) but my second stage gives my coëfficiënt in which I am interested a beta of 0 and a p-value of 1. No matter what dependent variable I use the beta is Always 0 with a p-value of 1.

Does someone know why this the case? Or what could be wrong with my data that causes this?

Thanks in advance!


Less is more. Stay pure. Stay poor.
Please define what you mean by 2 stage least squares model.

Do you know that there really is a relationship?