I would like to understand how to calculate Portfolio Visualizer's CASHX symbol for every month. This ticker is used as a risk-free rate, based on historical 3-month treasury bill rates published by FRED.
According to PV, FRED data must be converted from discount basis to add-on basis by taking the end-of-month discount rate and converting it to add-on rate.
Here are some FRED Data and their corresponding risk-free return rate
Date FRED CASHX 1985/01/31 8.05 0.66% 1985/02/28 8.50 0.68% 2020/02/31 1.25 0.13% 2020/03/31 0.11 0.10%
Thanks for any answer