l****z
发帖数: 29846 | 1 Republicans are expected to win the White House under two economic models
that have accurately forecast presidential elections for decades.
A third model run by Moody’s Analytics predicts Democrats will win the
White House, in part because of President Obama’s rising approval rating.
The three models are being challenged like never before by the presence of
GOP presidential front-runner Donald Trump, whose campaign has shaken up
politics.
Trump’s fights with Ted Cruz and his other GOP rivals have electrified his
supporters but have turned off other voters. A Washington Post-ABC poll last
week found that 67 percent of registered voters held an unfavorable view of
the outspoken billionaire. That has given hope to Democrats that even with
a weakened Hillary Clinton as their nominee, their party could cruise to
victory.
“As economists this is a very unusual election and there’s a lot more
uncertainty introduced this time around that could upset the balance and the
historical relationship of how marginal voters vote,” said Dan White, an
economist with Moody’s Analytics who oversees the firm’s monthly election
model.
Ray Fair, a Yale professor who launched his model in 1978, told The Hill
that while all elections include unruly features that an economic model can
’t pick up, “this one seems particularly unusual.”
“If there’s any time in which personalities would trump the economy it
would be this election,” Fair said.
Fair’s model has correctly forecast all but three presidential races since
1916 but was wrong in 2012, when it predicted a narrow loss for Obama to
Mitt Romney.
It relies on just three pieces of information: per capita growth rate of
gross domestic product in the three quarters before an election, inflation
over the entire presidential term and the number of quarters during the term
growth per capita exceeds 3.2 percent.
Given the sluggish economy, his model doesn’t show enough growth under
Obama to predict a Democratic win in the election. In his most recent
forecast from January, his model predicted a 45.66 percent share of the
presidential vote for the Democratic candidate, less than the 49 percent it
predicted in 2012.
The other two models, unlike Fair’s, consider the incumbent president’s
approval rating. In both cases, Obama’s improving favorability helps his
party’s chances of winning the White House. But only one of those models
predicts a Democratic win.
Emory University’s Alan Abramowitz, whose model has correctly predicted
every outcome since 1992, forecasts a Republican win.
It measures the incumbent president's job-approval rating by the end of June
of the election year; the economy's growth during the first half of year,
especially during the second quarter; and how long the incumbent party has
been in the White House.
By this methodology, the Democratic candidate can expect to receive 48.7
percent of the vote — with Obama's approval rating at 50 percent —
according to his most recent calculation.
But since that prediction, Obama’s approval rating has ticked up to 52
percent.
Moody’s arrives at a similar result, but one that is better for Democrats.
That model, which hasn’t missed an election since it was created in 1980,
awards Electoral College votes to each party based on state-by-state
outcomes. The most important economic variable is income growth by state,
including job and wage growth, hours worked and the quality of the jobs
being created in the two years leading up to an election. The model also
factors in home and gasoline prices on a state level, as well as
presidential approval numbers.
The Moody’s equation also includes an additional dummy variable that
penalizes Democrat incumbents, stemming from the theory that Democrats and
Democrat-leaning independent voters are more likely to switch sides and vote
for a Republican candidate than vice versa.
Moody’s latest model, set for release this week, shows that the Democratic
nominee would take 332 electoral votes compared to 206 for the Republican
nominee.
The main driver of the change was the president's approval rating, a first-
time variable added into the model this year, White said.
The president's approval rating has risen 3 percentage points since the
first model was released in August.
White says the unruly GOP primary may be helping Obama.
“The gains lately could be construed as a reflection of what a mess the
primary process has become in recent weeks,” he said. Trump, who has high
unfavorable ratings among some voter groups, could be giving Obama’s
approval rating a boost.
Abramowitz told The Atlanta-Journal Constitution last week that “all the
noise being made by the presidential campaign, especially by the Republican
campaign, has taken attention away from what may turn out to be more
significant for the general election — Barack Obama’s rising approval
rating.”
His research has found that the president’s approval rating is an essential
predictor of the election results even when the president is not on the
ballot, and Obama's has risen to its highest level in many months.
White said that one of the most frequently asked questions he gets is
whether a Trump variable could be added into the model to test out how his
brand of fireworks factors in.
No way, he said.
“The model doesn’t know or care if there are two or 10 candidates,” he
said. “It knows the economics and whether marginal swing voters will keep
the incumbent party in or not.”
In fact, their models are designed to sweep away the effects of boisterous
personalities and the usual ebbs and flows of a long presidential campaign
season and instead track specific economic factors that voters deem most
important.
Justin Wolfers, an economics professor at the University of Michigan and
senior fellow at the Brookings Institution who has researched the
reliability of economic models, said that while every election is different
the “point of the statistical models is to try to find the underlying
similarity across all of them.”
“So the logic that says that these models should have worked over the past
few decades also says that they should work in this election cycle, too,”
he told The Hill.
“There's no reason to think the models should do better or worse in 2016,”
he said. | d********f
发帖数: 43471 | 2 Obama’s rising approval rating
恩，不满的都不poll了，rating能不高么，多poll几回就100%满意了
his
last
【在 l****z 的大作中提到】
: Republicans are expected to win the White House under two economic models
: that have accurately forecast presidential elections for decades.
: A third model run by Moody’s Analytics predicts Democrats will win the
: White House, in part because of President Obama’s rising approval rating.
: The three models are being challenged like never before by the presence of
: GOP presidential front-runner Donald Trump, whose campaign has shaken up
: politics.
: Trump’s fights with Ted Cruz and his other GOP rivals have electrified his
: supporters but have turned off other voters. A Washington Post-ABC poll last
: week found that 67 percent of registered voters held an unfavorable view of
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