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b-spline quantile regression with statsmodels

#!/usr/bin/env python3

import matplotlib.pyplot as plt
import numpy as np
import statsmodels.formula.api as smf


x = np.linspace(0, 2, 100)
y = np.sqrt(x) * np.sin(2 * np.pi * x) + np.random.random_sample(100)

mod = smf.quantreg('y ~ bs(x, df=9)', dict(x=x, y=y))
res = mod.fit(q=0.5)
print(res.summary())

plt.plot(x, y, '.')
plt.plot(x, res.predict(), 'r')
plt.show()

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b-spline quantile regression with statsmodels

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