Python 使用 distplot 绘制直方图时 y 轴的单位是什么？
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What is the unit of the y-axis when using distplot to plot a histogram?
提问by Harry
What is the unit of the y-axis when using distplot to plot a histogram? I have plotted different histograms together with a normal fit and I see that in one case, it has a range of 0 to 0.9 while in another a range of 0 to 4.5.
使用 distplot 绘制直方图时 y 轴的单位是什么？我已经绘制了不同的直方图和正常拟合，我看到在一种情况下，它的范围是 0 到 0.9，而在另一种情况下，它的范围是 0 到 4.5。
采纳答案by cphlewis
From help(sns.distplot):
来自help(sns.distplot)：
norm_hist: bool, otional If True, the histogram height shows a density rather than a count. This is implied if a KDE or fitted density is plotted.
norm_hist: bool, otional 如果为 True，则直方图高度显示密度而不是计数。如果绘制了 KDE 或拟合密度，则暗示了这一点。
A densityis scaled so that the area under the curve is 1, so no individual bin will ever be taller than 1 (the whole dataset). But kdeis Trueby default and overrides norm_hist, so norm_histchanges the y-units only if you explicitly set kdeto False:
甲密度被标定，因此，曲线下面积为1，所以没有独立的贮藏将永远是高度大于1（整个数据集）。但默认情况下kde是Trueoverrides norm_hist，因此norm_hist仅当您明确设置kde为时才更改 y 单位False：
import matplotlib.pyplot as plt
import numpy as np
import seaborn as sns
fig, axs = plt.subplots(figsize=(6,6), ncols=2, nrows=2)
data = np.random.randint(0,20,40)
for row in (0,1):
for col in (0,1):
sns.distplot(data, kde=row, norm_hist=col, ax=axs[row, col])
axs[0,0].set_ylabel('NO kernel density')
axs[1,0].set_ylabel('KDE on')
axs[1,0].set_xlabel('norm_hist=False')
axs[1,1].set_xlabel('norm_hist=True')
