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    "## Linear Regression: Model Estimation\n",
    "\n",
    "**Functions**\n",
    "\n",
    "`sm.OLS`\n",
    "\n",
    "### Exercise 32\n",
    "Use the OLS function to estimate the coefficients of the Fama-French portfolios (monthly data) on the\n",
    "market, size and value factors. Include a constant in the regressions. Use only the four\n",
    "extremum portfolios – that is the 1-1, 1-5, 5-1 and 5-5 portfolios. Estimate the model with\n",
    "homoskedastic errors and with White's covariance estimator."
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    "### Exercise 33\n",
    "Are the parameter standard errors similar using the two covariance estimators?\n",
    "If not, what does this mean? "
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    "### Exercise 34\n",
    "How much of the variation is explained by these three regressors?"
   ]
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