Piglet Update - Standard Deviation And Variance Form

I worked on a form for adding Standard Deviation and Variance columns to data sets today. Since standard deviation is the square root of variance the two made sense to put together. A rough draft of it is below:

Std Deviation Screen

This form has a lot of nice improvements over my first batch of screens.
1) The user has the option of multiple operations from this form.
2) The user can direct these operations on multiple columns using this one screen.
3) The user is allowed to come up with their own name for the resulting column.

One difficult aspect of the form design was the checkboxes inside the TableModel. Shout out to Jay Askren with good advice here on stackoverflow on how to do this.

The pig latin behind this was a little tricky to work but I've liked how its all turning out.