Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
We report a field experiment comparing the efficacy of two impact-based appeals conducted by Oxfam Australia. Both appeal types demonstrated Oxfam Australia’s previous humanitarian impact, one in a qualitative (narrative) and the other in a quantitative (statistical) manner. We find that the quantitative appeal caused both a greater number and size of donations. We also find heterogeneity in the treatment effects across donor characteristics.