June 19, 2018 at 7:26 pm
#579
Bill Finzer
Keymaster
Hello again,
I neglected to address the rationale. Thinking about the situation, there are two kinds of “cases”: states, and rates. Each state has a rate for each year, and each rate for a given year belongs to a certain state. This implies a hierarchy. Row by column structures are far from ideal for modeling hierarchies. CODAP allows you to create any number of levels, and this works very well for a surprising number of situations.
Bill