I am conducting a performance comparison analysis among sustainable and conventional mutual funds. I want to analyse the last 6 years and focus also on the subperiod of the COVID-19 crisis. I have daily data regarding returns. However, I did not find previous studies that employ the Fama-French model on daily returns. Could you help me please? I would like to know if any inference on the Jensen's alpha would be misleading and if in case it would be better to use weekly returns. Many thanks!!!