I would like to build a simplified alluvial/sankey plot in R that shows the same categories on both sides and only visualizes their change in size.
Probably best illustrated by this sketch.
How can I achieve this?
I tried the ggalluvial and the network3D package to achieve this, but always ran into the problem that I can't model a 1:1 relationship (with differently sized categories on the other side), but only m:n relationships based on the frequencies of combinations (ggalluvial) or based on the relation of how the flow should split up (network3D).
Thanks for your help!