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    "## ARMA Modeling: Forecasting\n",
    "\n",
    "**Functions**\n",
    "\n",
    "`tsa.SARIMAX.forecast`\n",
    "\n",
    "### Exercise 70\n",
    "Produce 1-step forecasts from your preferred model in the previous exercise, as well\n",
    "as a random-walk model. \n",
    "\n",
    "1. Are the forecasts objectively accurate?\n",
    "2. Compare these forecasts to the random walk models using MSE and MAE.\n",
    "\n",
    "**Note**: Use 50% of the sample to estimate the model and 50% to evaluate it."
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    "### Exercise 71\n",
    "\n",
    "Produce 3-step forecasts from the models selected in the previous exercises as well as a random walk model.\n",
    "\n",
    "1. Compare these forecasts to the random walk models using MSE and MAE.\n"
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