import wooldridge as wooimport pandas as pdimport linearmodels as plmwagepan = woo.dataWoo('wagepan')# estimate different models:wagepan = wagepan.set_index(['nr', 'year'], drop=False)reg_ols = plm.PooledOLS.from_formula(formula='lwage ~ educ + black + hisp + exper + I(exper**2) +''married + union + C(year)', data=wagepan)results_ols = reg_ols.fit()reg_re = plm.RandomEffects.from_formula(formula='lwage ~ educ + black + hisp + exper + I(exper**2) +''married + union + C(year)', data=wagepan)results_re = reg_re.fit()reg_fe = plm.PanelOLS.from_formula(formula='lwage ~ I(exper**2) + married + union +''C(year) + EntityEffects', data=wagepan)results_fe = reg_fe.fit()# print results:theta_hat = results_re.theta.iloc[0, 0]print(f'theta_hat: {theta_hat}\n')table_ols = pd.DataFrame({'b': round(results_ols.params, 4),'se': round(results_ols.std_errors, 4),'t': round(results_ols.tstats, 4),'pval': round(results_ols.pvalues, 4)})print(f'table_ols: \n{table_ols}\n')table_re = pd.DataFrame({'b': round(results_re.params, 4),'se': round(results_re.std_errors, 4),'t': round(results_re.tstats, 4),'pval': round(results_re.pvalues, 4)})print(f'table_re: \n{table_re}\n')table_fe = pd.DataFrame({'b': round(results_fe.params, 4),'se': round(results_fe.std_errors, 4),'t': round(results_fe.tstats, 4),'pval': round(results_fe.pvalues, 4)})print(f'table_fe: \n{table_fe}\n')
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