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.
In this chart, we take the PCA coordinates and color the participant locations by the number of total votes. Hopefully, it looks random. If it doesn't, we might imagine the following scenario:
We know this scenario - that voters don't see controversial comments - happens. Polis mitigates in two ways: