Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
This paper proposes a new test of the null hypothesis of additive fixed effects versus the alternative of general interactive effects. This is not the only test of its kind in the literature; however, it is the only test that is valid in panels where T is fixed. The asymptotic distribution of the new test statistic is derived and simulation results are provided to suggest that it performs well in small samples.