using ols from statsmodels.formula.api - how to remove constant term?

2024/10/14 9:23:22

I'm following this first example in statsmodels tutorial:

http://statsmodels.sourceforge.net/devel/

How do I specify not to use constant term for linear fit in ols?

# Fit regression model (using the natural log of one of the regressors)
results = smf.ols('Lottery ~ Literacy + np.log(Pop1831)', data=dat).fit()

Answer

As shown here in the section on Operators, you can use "-1" in the formula string to remove an intercept term:

results = smf.ols('Lottery ~ Literacy + np.log(Pop1831) - 1', data=dat).fit()

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