[英]Density curve on histogram is flat
我正在嘗試 plot 一條遵循我的數據直方圖趨勢的曲線,我環顧四周並嘗試了其他人的代碼,但我仍然得到一條平線。 這是我的代碼
hist(Ferr,xlab = "Ferritin Plasma Concentration", ylab = "Frequency", main = "Histogram of Ferritin
Plasma Concentration", xlim = c(0,250), ylim = c(0,50), cex.axis=0.8, cex.lab=0.8,cex.main = 1)
curve(dnorm(x, mean = mean(Ferr), sd = sd(Ferr)), col="blue", add=TRUE)
lines(density(Ferr), col="red")
如果有人可以幫助我看看我哪里出錯了,那將非常感謝。
您需要設置freq = FALSE
(並刪除對ylim
和xlim
的約束並將"Frequency"
更改為"Density"
):
hist(Ferr,
freq= FALSE,
xlab = "Ferritin Plasma Concentration", ylab = "Density",
main = "Histogram of Ferritin Plasma Concentration",
cex.axis=0.8, cex.lab=0.8,cex.main = 1)
curve(dnorm(x, mean = mean(Ferr), sd = sd(Ferr)), col="blue", add=TRUE)
lines(density(Ferr), col="red")
玩具數據:
Ferr <- rnorm(1000)
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