我试图在 R 中绘制一个直方图,并用来自不同分布的密度覆盖它。它适用于常规直方图,但我无法让它与 ggplot2 包一起使用。
a <- dataset$age
现在遵循我的常规直方图的代码:
Histogram_for_age <- hist(a, prob=T, xlim=c(0,80), ylim=c(0,0.055), main="Histogram for age with density lines", xlab="age")
mean <- mean(a)
sd <- sd(a)
现在是密度的线/曲线:
lines(density(dataset$age), col="blue", lwd=2, lty=1)
curve(dnorm(x, mean = mean, sd = sd), add = T, col="red", lwd=2, lty=2)
curve(dgamma(x, shape =mean^2/sd^2, scale = sd^2/mean), add = T, col="goldenrod", lwd=2, lty=3)
和一个传说:
legend("topright",
c("actual distribution of age","gaussian distribution", "gamma distribution"),
lty=c(1,2,3),
lwd=c(2,2,2),col=c("blue","red","goldenrod"), cex=0.65)
到目前为止,这是我对 ggplot2 的尝试:
ggplot(dataset, aes(x=age)) +
geom_histogram(aes(y=..density..),
colour="black", fill="white") +
geom_density(alpha=.2, fill="lightblue") + stat_function(fun = dgamma, shape=shape)
什么 ggplot2 参数等效于我的 lines() 和 curve() 参数?