I'd like to associate modifiers with keywords.

Easier to explain with an example: listing keyword 'friend' in the
'Attributes' column applies +20% likelihood to the 'Invite to Dinner'
column. Let's say keyword 'wife_dislikes' is *also* listed in the
'Attributes' column, so then a separate -30% modifier is applied to
'Invite to Dinner'. When I calculate the table, the calculation looks
at the list of attributes, and applies the appropriate modifiers to
the appropriate columns. (And it's all cumulative, so the cumulative
modifier in our example is -10%.)