The 2012 election has been a very fractious election, keenly watched for a possible outcome for a very long time. There were a large number of polls tracking the potential outcome and analysts tracking the polls. Nate Silver has rightly won kudos for getting it right a second time. Silver's model is heavily driven by data from opinion polls and has a very high temporal resolution. On the other hand, Lichtman's model is simpler and based on 13 Keys which are not linked to the impact of campaigns on opinion polls; the assessment of the 13 keys is a matter of judgment. Both are covered in the following posts.
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