指示条形图的统计显着性差异 [英] Indicating the statistically significant difference in bar graph

问题描述

我使用条形图表示每个组的数据.这些酒吧中的一些酒吧彼此之间有很大的不同.如何显示条形图中的显着差异?

I use a bar graph to indicate the data of each group. Some of these bars differ significantly from each other. How can I indicate the significant difference in the bar plot?

import numpy as np
import matplotlib.pyplot as plt
menMeans   = (5, 15, 30, 40)
menStd     = (2, 3, 4, 5)
ind = np.arange(4)    # the x locations for the groups
width=0.35
p1 = plt.bar(ind, menMeans, width=width, color='r', yerr=menStd)
plt.xticks(ind+width/2., ('A', 'B', 'C', 'D') )

我的目标是

推荐答案

在这里，我完成了一些建议，在处理复杂图时建议这样做.将自定义格式提取到词典中，当您想要更改参数时，它使工作变得简单-可以将此词典传递给多个图.我还为annotate迭代值编写了一个自定义函数，作为奖励，如果您确实愿意，它可以在(A,C)之间注释(不过，我的评论是，这不是正确的视觉方法).数据更改后，可能需要进行一些调整，但这应该使您走上正确的轨道.

I've done a couple of things here that I suggest when working with complex plots. Pull out the custom formatting into a dictionary, it makes life simple when you want to change a parameter - and you can pass this dictionary to multiple plots. I've also written a custom function to annotate the itervalues, as a bonus it can annotate between (A,C) if you really want to (I stand by my comment that this isn't the right visual approach however). It may need some tweaking once the data changes but this should put you on the right track.

import numpy as np
import matplotlib.pyplot as plt
menMeans   = (5, 15, 30, 40)
menStd     = (2, 3, 4, 5)
ind  = np.arange(4)    # the x locations for the groups
width= 0.7
labels = ('A', 'B', 'C', 'D')

# Pull the formatting out here
bar_kwargs = {'width':width,'color':'y','linewidth':2,'zorder':5}
err_kwargs = {'zorder':0,'fmt':None,'linewidth':2,'ecolor':'k'}  #for matplotlib >= v1.4 use 'fmt':'none' instead

fig, ax = plt.subplots()
ax.p1 = plt.bar(ind, menMeans, **bar_kwargs)
ax.errs = plt.errorbar(ind, menMeans, yerr=menStd, **err_kwargs)


# Custom function to draw the diff bars

def label_diff(i,j,text,X,Y):
    x = (X[i]+X[j])/2
    y = 1.1*max(Y[i], Y[j])
    dx = abs(X[i]-X[j])

    props = {'connectionstyle':'bar','arrowstyle':'-',\
                 'shrinkA':20,'shrinkB':20,'linewidth':2}
    ax.annotate(text, xy=(X[i],y+7), zorder=10)
    ax.annotate('', xy=(X[i],y), xytext=(X[j],y), arrowprops=props)

# Call the function
label_diff(0,1,'p=0.0370',ind,menMeans)
label_diff(1,2,'p<0.0001',ind,menMeans)
label_diff(2,3,'p=0.0025',ind,menMeans)


plt.ylim(ymax=60)
plt.xticks(ind, labels, color='k')
plt.show()

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