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par(mfrow=c(2,2)) | |
x <- seq(-4,4,0.1) | |
plot(exp(x),main="eの累乗",xaxt="n",xlab="") | |
axis(side=1, at=1:length(x), labels=x) # ラベルの描画 | |
plot(1/exp(x),main="ひっくり返す",xaxt="n",xlab="") | |
axis(side=1, at=1:length(x), labels=x) # ラベルの描画 | |
plot(1/(1+exp(-x)),main="マイナスを掛ける",xaxt="n",xlab="") | |
axis(side=1, at=1:length(x), labels=x) # ラベルの描画 | |
plot(1/(1+2.7^(-x)),main="近似値は2.7",xaxt="n",xlab="") | |
axis(side=1, at=1:length(x), labels=x) # ラベルの描画 |
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# 正規分布のできるまで | |
plot(exp(-x),main="eの累乗",xaxt="n",xlab="") | |
axis(side=1, at=1:length(x), labels=x) # ラベルの描画 | |
plot(exp(-(x^2)/2),main="二乗して二で割る",xaxt="n",xlab="") | |
axis(side=1, at=1:length(x), labels=x) # ラベルの描画 | |
plot(1/sqrt(2*pi)*exp(-(x^2)/2),main="1/sqrt(2*pi)を掛ける",xaxt="n",xlab="") | |
axis(side=1, at=1:length(x), labels=x) # ラベルの描画 | |
plot(1/sqrt(2*pi*3)*exp(-((x+1)^2)/(2*3)),main="平均-1,SD3にしてみた",xaxt="n",xlab="") | |
axis(side=1, at=1:length(x), labels=x) # ラベルの描画 |
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# 参考 | |
# http://d.hatena.ne.jp/isseing333/20100508/1273325218 | |
library(ggplot2) | |
#---数式で記述 | |
gauss.dencity <- function(x) 1/sqrt(2*pi)*exp(-x^2/2) | |
plot(gauss.dencity, -5, 5, xaxs="i",yaxs="i", bty="l", ylim=c(0, 0.5), las=1) | |
#---ダミーデータで描く |
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library(mvtnorm) | |
library(scatterplot3d) | |
############################################ 無相関 | |
cor.mat <- matrix(c(1,0,0,1),nrow=2) | |
x100 <- rmvnorm(n=100,mean=c(0,0),sigma=cor.mat) | |
x1000 <- rmvnorm(n=1000,mean=c(0,0),sigma=cor.mat) | |
x10000 <- rmvnorm(n=10000,mean=c(0,0),sigma=cor.mat) |
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library(MASS) | |
library(psych) | |
N <- 1000 | |
cor.mat <- matrix(c(1,0.5,0.4,0.7,0.8, | |
0.5,1,0.3,0.4,0.4, | |
0.4,0.3,1,0.6,0.3, | |
0.7,0.4,0.6,1,0.9, | |
0.8,0.4,0.3,0.9,1),ncol=5) | |
# 乱数発生 | |
dat <- as.data.frame(mvrnorm(N,mu=c(0,0,0,0,0),Sigma=cor.mat)) |
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# ダミーデータによる理解 | |
# 標準正規乱数を発生させて数え上げる | |
count.n.rand <- function(N,rg=seq(-4,4,0.1),mu=0,sd=1){ | |
X <- rnorm(N,mu,sd) | |
lt <- list() | |
for(i in 1:length(rg)){ | |
lt[i] <- length(X[X<rg[i]]) #データがある値を超えた数を数える | |
} | |
return(unlist(lt)) | |
} |
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theta <- seq(-4,4,0.1) | |
# 1PL logistic model | |
# 関数 | |
OnePL.func <- function(x,b) 1/(1+exp(-1.7*(x-b))) | |
# データ生成 | |
dat <- data.frame(theta,b0=OnePL.func(theta,0),b1=OnePL.func(theta,1),bn1=OnePL.func(theta,-1)) | |
# データ整形 |
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# 2PL logistic model | |
# 関数 | |
TwoPL.func <- function(x,a=1,b=0) 1/(1+exp(-1.7*a*(x-b))) | |
# データ生成...bは0で統一 | |
dat <- data.frame(theta, | |
a1=TwoPL.func(theta,a=1,b=0), | |
a05=TwoPL.func(theta,a=0.5,b=0), | |
a2=TwoPL.func(theta,a=2,b=0)) |
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####### bはmuに,aはsdに対応している | |
plot.dat <- data.frame(cbind(theta, | |
TwoPL.func(theta,a=1,b=0), # 標準 | |
TwoPL.func(theta,a=2,b=1), # a=2,b=1 | |
count.n.rand(N=50,sd=1,mu=0,rg=theta)/50, | |
count.n.rand(N=100,sd=1/2,mu=1,rg=theta)/100)) | |
names(plot.dat) <- c("theta","default","a2b1","N50","N100") | |
# データの整形 | |
library(tidyr) | |
plot.dat <- tidyr::gather(plot.dat,key=models,value=val,-theta) |
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# 3PL logistic model | |
# 関数 | |
ThreePL.func <- function(x,a=1,b=0,c=0) c+(1-c)/(1+exp(-1.7*a*(x-b))) | |
# データ生成...bは0で統一 | |
dat <- data.frame(theta, | |
ThreePL.func(theta,a=1,b=0,c=0.0), | |
ThreePL.func(theta,a=1,b=1,c=0.2), | |
ThreePL.func(theta,a=2,b=-1,c=0.4)) |
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