Problem you'd like to fix
In all the spreadsheet-like applications (regression, statistics), it should be easy to copy data between columns
Describe the solution you'd like
When clicking copy on a column header, it should copy the data in the rows below it, and when clicking paste on another column's heading, the data copied should fill up the rows below it.
Describe alternatives you've considered
One could click "fill with formula" and make the list equal to the list he wanted to copy from, but it is slower and less intuitive