Histogram with Boxplot above in Python

Question

Hi I wanted to draw a histogram with a boxplot appearing the top of the histogram showing the Q1,Q2 and Q3 as well as the outliers. Example phone is below. (I am using Python and Pandas)

I have checked several examples using matplotlib.pyplot but hardly came out with a good example. And I also wanted to have the histogram curve appearing like in the image below.

I also tried seaborn and it provided me the shape line along with the histogram but didnt find a way to incorporate with boxpot above it.

can anyone help me with this to have this on matplotlib.pyplot or using pyplot

Solution 1

import numpy as np
import seaborn as sns
import matplotlib.pyplot as plt

sns.set(style="ticks")

x = np.random.randn(100)

f, (ax_box, ax_hist) = plt.subplots(2, sharex=True, 
                                    gridspec_kw={"height_ratios": (.15, .85)})

sns.boxplot(x, ax=ax_box)
sns.distplot(x, ax=ax_hist)

ax_box.set(yticks=[])
sns.despine(ax=ax_hist)
sns.despine(ax=ax_box, left=True)

Solution 2

Expanding on the answer from @mwaskom, I made a little adaptable function.

import seaborn as sns
def histogram_boxplot(data, xlabel = None, title = None, font_scale=2, figsize=(9,8), bins = None):
    """ Boxplot and histogram combined
    data: 1-d data array
    xlabel: xlabel 
    title: title
    font_scale: the scale of the font (default 2)
    figsize: size of fig (default (9,8))
    bins: number of bins (default None / auto)

    example use: histogram_boxplot(np.random.rand(100), bins = 20, title="Fancy plot")
    """

    sns.set(font_scale=font_scale)
    f2, (ax_box2, ax_hist2) = plt.subplots(2, sharex=True, gridspec_kw={"height_ratios": (.15, .85)}, figsize=figsize)
    sns.boxplot(data, ax=ax_box2)
    sns.distplot(data, ax=ax_hist2, bins=bins) if bins else sns.distplot(data, ax=ax_hist2)
    if xlabel: ax_hist2.set(xlabel=xlabel)
    if title: ax_box2.set(title=title)
    plt.show()

histogram_boxplot(np.random.randn(100), bins = 20, title="Fancy plot", xlabel="Some values")

Image

Comments

[Isura Nirmal]

Thank You! Exactly the way I was looking for. But it came with some problems, There are gaps between the columns and I tried to use bins argument but no luck. Also I want the y axis to have the frequency not the probability. I didnt find any way to do this in seaborn documentation. Can you help?

[iayork]

These are completely separate from your original question, so you should ask them as two new questions.

[Isura Nirmal]

Dotn worry guys. I actually find the solutions after some time of search. Thank you for your corporation.

[trock2000]

any idea how to combine 8 separate instances of the above-styled plots into a single plot?

[DaveL17]

Please repair your code formatting and provide some context why your solution is preferable to the other answers provided.