Start with three pinned channel rows. Each row has visitors and orders.
For each row, compute orders / visitors. Email is 12 / 120 = 10%, search is 6 / 100 = 6%, and ads is 3 / 50 = 6%.
The bars show the derived percentages, not the raw visitor counts.
A tiny derived-rate readout: start from visitors and orders, compute orders divided by visitors, and plot the pinned percentages.
highlighted = computed this step
Load raw counts
Start with 3 pinned rows: visitors and orders by channel.
raw counts
Compute each rate
Compute rate as orders divided by visitors: email is 12 / 120 = 10%.
orders over visitors
Draw rate bars
Draw the 3 pinned percentages as bars: 10%, 6%, and 6%.
rate bars
Read the rate summary
Readout: email has a 10% rate, while search and ads each have 6%.