Quote (thesnipa @ 12 Aug 2020 04:46)
thats still a crazy reliable model, even if you exclude races like Obama-Romney where the winner was clear you still have someone doing insanely well on guessing coin flips.
Depends. When they write that his model "predicted" the winner in every race (but one...) of the last 120 years, do they mean correct classification on the full data set, or some sort of leave-one-out crossvalidation, or do they mean out-of-sample predictions for the respective next election period based on a model fit with all the data that was available until that point?
A perfect in-sample fit would be trivial with 13 'keys'/regressors/nodes, and LOO-crossvalidation is unrealistic since it would use information from future elections to "predict backwards in time". And then there's a ton of stationarity assumptions implied by this model which are definitely violated in the extraordinary 2020 environment. For example, the assumption that the importance of the economy for voters is the same in 2020 as in 2016... or in 1928.
It's crap that only looks good on the surface. Polling-based election models make far more sense, at least as long as they are set up by someone competent. All those fundamentals are typically captured by recent polling anyway, but polling can also catch structural breaks in how issues and fundamentals affect voting.
For example, in normal times, it is reasonable to assume that voters will blame the party in power if the economy is bad. A fundamentals model like Lichtman's has to work based on the assumption that voters will blame the incumbent for the economy no matter what, because that's how it was in all the years/data points their model was built on. But things might be different when an external shock like a global pandemic has caused an otherwise healthy economy to crater. Polling indicates that this is indeed true, the economy is still the issue where Trump polls best, and people still seem to trust him at least as much as Biden on the economy. So voters are seemingly not blaming Trump for the abysmal economy this year, which goes against all conventional wisdom and is something a fundamentals-only model cannot possibly account for.
This post was edited by Black XistenZ on Aug 11 2020 09:33pm