Model regresi

Berlatih Pertanyaan Wawancara Statistik dengan Python

Conor Dewey

Data Scientist, Squarespace

Mulai

Sebar berkorelasi

¹ Wikimedia

Asumsi

Hubungan linear
Galat berdistribusi normal
Homoskedastisitas
Observasi independen

Regresi linear

Pemasangan linear

¹ Wikipedia

Regresi linear

Rumus regresi linear

Contoh: regresi linear

from sklearn.linear_model import LinearRegression 
lm = LinearRegression()
lm.fit(X_train, y_train)

LinearRegression(copy_X=True, fit_intercept=True, 
                    n_jobs=None, normalize=False)

Contoh: regresi linear

coef = lm.coef_
print(coef)

[0.79086669]

Regresi logistik

Visualisasi regresi logistik

¹ Wikimedia

Regresi logistik

Fungsi sigmoid

Contoh: regresi logistik

from sklearn.linear_model import LogisticRegression
clf = LogisticRegression(solver='lbfgs')
clf.fit(X_train, y_train)

LogisticRegression(C=1.0, class_weight=None, 
                   dual=False, fit_intercept=True, 
                   intercept_scaling=1,
                   max_iter=100, multi_class='warn',
                   n_jobs=None, penalty='l2',
                   random_state=None, solver='lbfgs',
                   tol=0.0001, verbose=0, 
                   warm_start=False)

Contoh: regresi logistik

coefs = clf.coef_
print(coefs)

[[0.4015177  3.85056451]]

accuracy = clf.score(X_test, y_test)
print(accuracy)

0.8583333333333333

Ringkasan

Tinjauan
Asumsi
Regresi linear
Regresi logistik

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Berlatih Pertanyaan Wawancara Statistik dengan Python