I have 5 asset returns and 1 risk free returns. I have been trying to calculate risk premium and standard deviations of excess returns but I keep getting this error for risk premium
Error in xts(risk_premium, order.by = dates) : order.by requires an appropriate time-based object
This is the code I've been trying to
risk.premium(FFportfolios$Market_index, FFportfolios$T.bill)
FFportfolios is the dataset name.
Market_index is one of the assets.
T.bill is the risk free asset.