I need to get swaption volatility surfaces for a time lenght of at least 10 years. It is for my master thesis.
I looked up at the Q&A and I tried to insert them with RHistory function: =RHistory("USD3MFSR";"BID.TIMESTAMP;BID.CLOSE";"NBROWS:1500 INTERVAL:1D";"CH:IN;Fd STREPEAT:N";B3)
Unfortunately it's not working. It says that CH it's not a valid refresh parameter. What can I do?