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March 24, 2015 03:03
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久保みどり本 p.120 ~ 121 図6.4
ロジスティック関数のパラメタを変化させたときの曲線の動き
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| # p.120 | |
| logistic <- function(z){ | |
| 1 / (1+exp(-z)) | |
| } | |
| # z <- seq(-6,6,0.1) | |
| # plot(z,logistic(z),type="l") | |
| x <- seq(-3,3,0.1) | |
| z <- function(x,b_1,b_2){ | |
| # z = b_1 + b_2*x | |
| b_1+b_2*x | |
| } | |
| # β_2=2 | |
| plot(x, logistic(z(x, 0,2)),type="l") | |
| lines(x,logistic(z(x,-3,2)),type="l",lty="dashed") | |
| lines(x,logistic(z(x, 2,2)),type="l",lty="dotted") | |
| # β_1=0 | |
| plot(x, logistic(z(x, 0, 2)),type="l") | |
| lines(x,logistic(z(x, 0, 4)),type="l",lty="dashed") | |
| lines(x,logistic(z(x, 0,-1)),type="l",lty="dotted") |
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