def test_pandas_const_df_prepend(): dta = longley.load_pandas().exog dta = tools.add_constant(dta, prepend=True) assert_string_equal('const', dta.columns[0]) assert_equal(dta.var(0)[0], 0)
def test_pandas_const_series_prepend(): dta = longley.load_pandas() series = dta.exog['GNP'] series = tools.add_constant(series, prepend=True) assert_string_equal('const', series.columns[0]) assert_equal(series.var(0)[0], 0)