Create a dataset that has monthly returns for the following stocks: TSLA, JNJ, GOOGL, and GE from January 1, 2018 to December 31, 2022 using their "adjusted" price. Create an equally weighted portfolio consisting of these stocks and calculate the monthly returns of your portfolio. use the below Market Returns and Risk-Free Rate dataset and join with your portfolio to obtain the market return ("market return") and risk-free rate ("risk-free"). date,market_return,risk_free 1/31/18,0.04748109,0.0146 2/28/18,-0.038947372,0.0165 3/29/18,-0.026884499,0.0173 4/30/18,0.002718775,0.0187 5/31/18,0.021608342,0.0193 6/29/18,0.004842436,0.0193 7/31/18,0.036021556,0.0203 8/31/18,0.030263211,0.0211 9/28/18,0.004294287,0.0219 10/31/18,-0.069403356,0.0234 11/30/18,0.017859357,0.0237 12/31/18,-0.091776895,0.0245 1/31/19,0.078684402,0.0241 2/28/19,0.029728889,0.0245 3/29/19,0.017924256,0.024 4/30/19,0.039313498,0.0243 5/31/19,-0.065777731,0.0235 6/28/19,0.068930164,0.0212 7/31/19,0.013128152,0.0208 8/30/19,-0.018091627,0.0199 9/30/19,0.017181178,0.0188 10/31/19,0.020431771,0.0154 11/29/19,0.034047038,0.0159 12/31/19,0.028589819,0.0155 1/31/20,-0.001628093,0.0155 2/28/20,-0.084110484,0.0127 3/31/20,-0.125119282,0.0011 4/30/20,0.126844038,9.00E-04 5/29/20,0.04528182,0.0014 6/30/20,0.018388397,0.0016 7/31/20,0.055101321,9.00E-04 8/31/20,0.070064667,0.0011 9/30/20,-0.03922797,0.001 10/30/20,-0.027665786,9.00E-04 11/30/20,0.107545635,8.00E-04 12/31/20,0.037121459,9.00E-04 1/29/21,-0.011136661,6.00E-04 2/26/21,0.026091451,4.00E-04 3/31/21,0.042438633,3.00E-04 4/30/21,0.052425321,1.00E-04 5/28/21,0.005486489,0.0001 6/30/21,0.02221401,5.00E-04 7/30/21,0.022748055,6.00E-04 8/31/21,0.028990416,4.00E-04 9/30/21,-0.047569169,4.00E-04 10/29/21,0.069143836,5.00E-04 11/30/21,-0.008333706,5.00E-04 12/31/21,0.043612913,6.00E-04 1/31/22,-0.052585165,0.0022 2/28/22,-0.031360492,0.0035 3/31/22,0.035773288,0.0052 4/29/22,-0.087956712,0.0085 5/31/22,5.32E-05,0.0116 6/30/22,-0.08392,0.0172 7/29/22,0.091116392,0.0241 8/31/22,-0.042440128,0.0296 9/30/22,-0.093395672,0.0333 10/31/22,0.079863414,0.0422 11/30/22,0.053752893,0.0437 12/30/22,-0.058971474,0.0442