Hi there,
You'll need to create two new columns as indicators of whether Column A is above or below the threshold and Column B is above or below the threshold.
Let's use the Big Class data from the Sample Data library as an example (Help->Sample Data and then in the Examples for Teaching section).
If we are interested in the 2x2 table for the number of students above and below a height of 62 and a weight of 120, we first need to create indicator columns for those conditions in each row.
For the height indicator you add a new column with a formula like this:
![4020_JMPScreenSnapz017.png 4020_JMPScreenSnapz017.png](https://community.jmp.com/t5/image/serverpage/image-id/220iB7DEEBCB15A3BEAE/image-size/medium?v=v2&px=400)
This will give you a column of capital Hs where height is above 62 and lowercase h where it's below.
Create a similar column for weight.
Then use these two columns in Fit Y by X to get a report like this.
![4022_JMPScreenSnapz019.png 4022_JMPScreenSnapz019.png](https://community.jmp.com/t5/image/serverpage/image-id/221iB0D45CFF3F3EA922/image-size/medium?v=v2&px=400)
The Contingency Table is the table you're looking for. The Mosaic Plot is the graphical representation of it.
Let us know if this isn't what you're looking for, or if you need more assistance.
-Jeff
-Jeff