How to plot Funnel Chart using Plotly Express | Plotly Dash Python

What is a funnel chart?

A funnel chart is a specialized chart type that demonstrates the flow of users through a business or sales process. The chart takes its name from its shape, which starts from a broad head and ends in a narrow neck. The number of users at each stage of the process are indicated from the funnel’s width as it narrows.

When you should use a funnel chart

Funnel charts are most often seen in business or sales contexts, where we need to track how a starting set of visitors or users drop out of a process or flow. This chart type shows how the starting whole breaks down into progressive parts.

By visualizing the number of users that make it to each stage of the process, a business can understand where there are significant drop offs and try to make changes to the user experience for the better. Note that there will not be enough detail in a funnel chart to say why an unexpected drop has occurred, so funnels are best used as a high-level visualization before moving into a deeper investigation.
Statistics to highlight in a funnel chart

In a funnel chart, the standard annotation options for each stage usually include showing the raw number of users or the proportion of users compared to the opening stage. Absolute counts are valuable at the start and end of the process to build an understanding of the overall volume of users. The relative proportions can provide quicker insights into how effective each stage of the process is. Where possible, it can be good to show both values so long as it does not clutter up the visualization too much.

For some visualization tools, you may have the option to show other annotations for each stage. One additional statistic worth tracking is the stage-to-stage proportions. Including this annotation between stages allows for concrete knowledge of drop off rates, without needing to resort to outside computation or estimation.

[nanabandoh]

simple and straight to the point. thank you