R로 연습하는 통계 면접 질문
Zuzanna Chmielewska
Actuary
$$f(x) = \frac{1}{1+e^{-x}} $$
$$f(x) = \frac{1}{1+e^{-x}} \in (0,1)$$
확률 예측: $$ p_i = P(y_i=1) = \frac{1}{1+e^{-(\beta_0+\beta_1 \cdot x_{i1}+...+\beta_p \cdot x_{ip})}} $$
로그잇 예측: $$ l_i = ln(\frac{p_i}{1-p_i}) = \beta_0+\beta_1 \cdot x_{i1}+...+\beta_p \cdot x_{ip}$$
model <- glm(y ~ x, data = df, family = "binomial")
model <- glm(y ~ x, data = df, family = "binomial") predict(model, newdata = new_df, type = "response")
glm()
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