How sparse is the dataset? How much agree, how much disagree, how much pass? Zero is 'passed' or 'did not see the comment to vote on it'. 1 is agree, -1 is disagree
Some things to notice about the matrix: comments are submitted over time, so participants who do not return will only have voted on the statements which were avialable when they arrived.
Long horizontal lines: participants who do return show up as a horizontal line sticking out into otherwise blank areas
Blank vertical lines: most likely statements which were moderated out of the conversation.