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April 12, 2022 14:06
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統計学実践ワークブック 第16章 重回帰分析 pp.135-136
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# ------------------------------ | |
# 統計学実践ワークブック | |
# 第16章 重回帰分析 pp.135-136 | |
# ------------------------------ | |
rm(list=ls()) | |
# NAのある行は除外する | |
# library(tidyverse) | |
# air <- drop_na(airquality,everything()) | |
air <- na.omit(airquality) | |
air |> dim() | |
air2 |> dim() | |
object.size(air) | |
object.size(air2) | |
identical(air, air2) | |
all.equal(air,air2) | |
str(air) | |
str(air2) | |
air |> rownames() | |
air2 |> rownames() | |
attr(air2,"na.action") | |
attr(air2,"na.action") <- NULL | |
rownames(air2) | |
rownames(air2) <- NULL | |
object.size(air) | |
object.size(air2) | |
identical(air, air2) | |
all.equal(air,air2) | |
# データの準備 | |
air <- na.omit(airquality) | |
# 構造確認 | |
str(air) | |
# 重回帰分析の実行 | |
model <- lm(Ozone ~., air) | |
summary(model) | |
# X: データ行列, n: 行数, k: パラメータ数 | |
X_raw <- air[, -1] | |
n <- nrow(X_raw) | |
k <- ncol(X_raw) | |
X <- cbind(1, as.matrix(X_raw) ) | |
# y: 目的変数 | |
y <- as.numeric( air[, 1] ) | |
# (X^{T}X)^{-1} | |
XtXinv <- solve(t(X) %*% X) | |
# 残差の標準誤差(Residual standard error) | |
s <- sqrt(mean( (y - X %*% XtXinv %*% t(X) %*% y )^2 ) *(n/(n-k-1))) | |
# 残差の標準誤差(Residual standard error) | |
s | |
# 回帰係数(Estimate)たち | |
XtXinv %*% t(X) %*% y |> t() | |
# 標準誤差(Std. Error)たち | |
sqrt( s^2 * diag(XtXinv) ) | |
# Coefficients: | |
# Estimate Std. Error t value Pr(>|t|) | |
#Day 0.27388 0.22967 1.192 0.23576 | |
# Dayのt統計量=1.192, 自由度=105に対するp-値(Pr(>|t|) of Day) | |
pt(q = 1.192, df = 105, lower.tail = F) * 2 | |
# 各種t値 | |
qt(c(0.025, 0.05, 0.1, 0.2359484/2, 0.2), df = 105, lower.tail = F) | |
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