There are countless strategies, indicators and systems that are mentioned in the popular press with such catchy names as the January Indicator, Dogs of the Dow, Elliott Wave Theory, Dow Theory, Sell in May and Go Away, and the Fed Model.
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This is a weighted average of short-term interest rates, corporate-bond yields, share prices and the trade-weighted dollar, with the weights derived from the Fed's model.
Morgan Chase has analysed the Fed's macroeconomic model of the American economy, derived from past behaviour.
The Fed's basic model suggests that about 14% of the impact of any interest-rate change on the economy is transmitted via housing markets.
He set out what might happen if American house prices fell by a massive 20% in 2007-08, assuming that an extra dollar of housing wealth changed consumer spending by 3.8 cents (as in the Fed's own model).
The weights are based on estimates from the Fed's own economic model.
Messrs Bernanke and Gertler find that in the early and mid-1990s the Fed held interest rates below the level their model predicted if policy were aimed at future inflation.
NCAR, heat and moisture figures from the fire are also fed back into the corresponding grid squares of the weather model, to simulate the way in which the fire, in turn, affects the weather.
In 2005, I had the opportunity to meet with Ben Bernanke and I asked why the Fed had elected to use the 10-year Treasury rate in their model.
Some of these are then fed into a prototyping machine, made by Objet of Israel, that can produce a 3-D model in lightweight plastic in minutes.
Dr Farley believes that if fed data on the number of members of a network who have been apprehended, an ordered-set model can give the authorities an estimate of the probability that the network has been disrupted.
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