2. Consider the following model for Bitcoin return equation: BTC = Bo + B,TSX+ B,GSPC: + 2 where BTC, TSX, GSPC, are the monthly return of Bitcoin, the TSX index, and S&P500 index, respectively. (a) We suspect that the model suffers from omitted variable bias because we have no data on consumer sentiment. Write down the procedure of Hausman test using the lagged variables TSX-2 and GSPC-2 as instruments for the two endogenous variables (TSX and GPC). (b) Is this model over-identified or just identified? Write down the procedure for J test if we have four instruments using the first two lags: TSX-1, TSX-2 GSPC-1 and GSPC-2 2. Consider the following model for Bitcoin return equation: BTC = Bo + B,TSX+ B,GSPC: + 2 where BTC, TSX, GSPC, are the monthly return of Bitcoin, the TSX index, and S&P500 index, respectively. (a) We suspect that the model suffers from omitted variable bias because we have no data on consumer sentiment. Write down the procedure of Hausman test using the lagged variables TSX-2 and GSPC-2 as instruments for the two endogenous variables (TSX and GPC). (b) Is this model over-identified or just identified? Write down the procedure for J test if we have four instruments using the first two lags: TSX-1, TSX-2 GSPC-1 and GSPC-2