There's a good analysis of how to design a visualization that shows both approval and disapproval here: http://eagereyes.org/blog/2012/embracing-uncertainty-tw

There's a good analysis of how to design a visualization that shows both approval and disapproval here: http://eagereyes.org/blog/2012/embracing-uncertainty-two-line-charts http://eagereyes.org/blog/2012/embracing-uncertainty-two-lin...