An Educator in Data Science

Bar graph with overlapping dots (Bar-dot) plot

    1 minute read   Follow @GaryLi

What is the Bar-dot plot?

  • This is a regular bar graph of the mean of data of each variable with overlapping dots for individual observation for that variable
  • A good way to represent the mean of the variable with standard error bar and distribution of each observation

How to create Bar-dot plot?

Useful reading: Data handling using pandas 

# you can use interactive python interpreter, jupyter notebook, spyder or python code
# I am using interactive python interpreter (Python 3.7)
>>> from bioinfokit import analys, visuz
# load dataset as pandas dataframe
# data should not have missing values (NaN)
>>> df = analys.get_data('bdot').data
>>> df.head()
    A   B   C   D
0  25  45  30  60
1  30  55  36  60
2  28  45  35  65
3  36  56  37  62
4  29  40  48  73

# create bardot plot with default parameters
>>> visuz.stat.bardot(df=df)  
# set parameter show=True, if you want view the image instead of saving
# visuz.stat.bardot(df=df, show= True)

Generated Bar-dot plot,

Change bar colors

# add different color to each bar
>>> visuz.stat.bardot(df=df, colorbar=("#f2aa4cff","#e69a8dff", "#adefd1ff", "#5b84b1ff") )

Change dot colors

# change dot color for all bars
>>> visuz.stat.bardot(df=df, colordot=["#616247ff"])   


# change dot color for each bar
>>> visuz.stat.bardot(df=df, colordot=["#616247ff", "#101820ff", "#006b38ff", "#3c1053ff"]  )

Change shape of dots

# change shape of dot
# see available shapes at https://matplotlib.org/3.1.1/api/markers_api.html
>>> visuz.stat.bardot(df=df, markerdot="D")

Change the bar width,

# change shape of dot
# see available shapes at https://matplotlib.org/3.1.1/api/markers_api.html
>>> visuz.stat.bardot(df=df, bw=0.6)

Add the labels to the axis,

>>> visuz.stat.bardot(df=df, axxlabel='X', axylabel='Y')

In addition to these parameters, the parameters for figure type (figtype), figure dimension (dim), Y axis ticks range (ylm), axis labels (axxlabel, axylabel),
axis labels font size and name (axlabelfontsize, axlabelfontname), resolution (r), and axis tick labels font size and font name (axtickfontsize, axtickfontname) can be provided.

Last updated: April 9, 2020

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