Examples of easy methods to create various kinds of pie charts utilizing Matplotlib to visualise the outcomes of database evaluation in a Jupyter Pocket book with Pandas
Whereas engaged on my Grasp’s Thesis titled “Elements Related to Impactful Scientific Publications in NIH-Funded Coronary heart Illness Analysis”, I’ve used various kinds of pie charts for example a number of the key findings from the database evaluation.
A pie chart could be an efficient selection for knowledge visualization when a dataset incorporates a restricted variety of classes representing elements of an entire, making it well-suited for displaying categorical knowledge with an emphasis on evaluating the relative proportions of every class.
On this article, I’ll display easy methods to create 4 various kinds of pie charts utilizing the identical dataset to offer a extra complete visible illustration and deeper perception into the info. To realize this, I’ll use Matplotlib, Python’s plotting library, to show pie chart visualizations of the statistical knowledge saved within the dataframe. If you’re not aware of Matplotlib library, an excellent begin is Python Information Science Handbook by Jake VanderPlas, particularly chapter on Visualization with Matplotlib and matplotlib.org.
First, let’s import all the required libraries and extensions:
Subsequent, we’ll put together the CSV file for processing:
The mini dataset used on this article highlights the highest 10 journals for coronary heart illness analysis publications from 2002 to 2020 and is an element of a bigger database collected for the Grasp’s Thesis analysis. The columns “Feminine,” “Male,” and “Unknown” signify the gender of the primary writer of the printed articles, whereas the “Whole” column displays the entire variety of coronary heart illness analysis articles printed in every journal.
For smaller datasets with fewer classes, a pie chart with exploding slices can successfully spotlight a key class by pulling it out barely from the remainder of the chart. This visible impact attracts consideration to particular classes, making them stand out from the entire. Every slice represents a portion of the entire, with its dimension proportional to the info it represents. Labels could be added to every slice to point the class, together with percentages to indicate their proportion to the entire. This visible approach makes the exploded slice stand out with out shedding the context of the complete knowledge illustration.
The identical exploding slices approach could be utilized to all different entries within the pattern dataset, and the ensuing charts could be displayed inside a single determine. The sort of visualization helps to spotlight the over illustration or underneath illustration of a specific class throughout the dataset. Within the instance supplied, presenting all 10 charts in a single determine reveals that not one of the prime 10 journals in coronary heart illness analysis printed extra articles authored by girls than males, thereby emphasizing the gender disparity.
A variation of the pie chart, generally known as a donut chart, will also be used to visualise knowledge. Donut charts, like pie charts, show the proportions of classes that make up a complete, however the middle of the donut chart will also be utilized to current further knowledge. This format is much less cluttered visually and may make it simpler to check the relative sizes of slices in comparison with a normal pie chart. Within the instance used on this article, the donut chart highlights that among the many prime 10 journals for coronary heart illness analysis publications, the American Journal of Physiology, Coronary heart and Circulatory Physiology printed essentially the most articles, accounting for 21.8%.
We will improve the visualization of further data from the pattern dataset by constructing on the earlier donut chart and making a nested model. The add_artist() methodology from Matplotlib’s determine module is used to include any further Artist (reminiscent of figures or objects) into the bottom determine. Much like the sooner donut chart, this variation shows the distribution of publications throughout the highest 10 journals for coronary heart illness analysis. Nevertheless, it additionally consists of a further layer that reveals the gender distribution of first authors for every journal. This visualization highlights {that a} bigger proportion of the primary authors are male.
In conclusion, pie charts are efficient for visualizing knowledge with a restricted variety of classes, as they permit viewers to shortly perceive a very powerful classes or dominant proportions at a look. On this particular instance, using 4 various kinds of pie charts gives a transparent visualization of the gender distribution amongst first authors within the prime 10 journals for coronary heart illness analysis publications, primarily based on the 2002 to 2020 mini dataset used on this examine. It’s evident {that a} greater proportion of the publication’s first authors are males, and not one of the prime 10 journals for coronary heart illness analysis printed extra articles authored by females than by males through the examined interval.
Jupyter Pocket book and dataset used for this text could be discovered at GitHub
Thanks for studying,
Diana
Notice: I used GitHub embeds to publish this text.
