regressitate 

To regret not hesitating before accepting an invitation

I said I would go out with him. I really regressitate having said yes.

regressitate by Karen M September 23, 2006

regresstimate 

An estimate based on a regression analysis. Also, regresstimation, and as a verb, to regresstimate.

I would regresstimate that the variables are significatly related.

regresstimate by Nerd April 10, 2005