Hello. My first post.

In the JMP Help files, there is a file called "US population.jmp" which is discussed in Chapter 23 of Stat & Graph.

This file has 3 columns, Year, Population, and X-formula.

Where and how did the X-formula column come to exist?

More specifically, if all I have are the Year and Population columns, and I want JMP to give me the best non-linear regression formula, how do I do this?

Thank you in advance.