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The wide-scale coverage and continuous operational capability of EISCAT_3D will make it a superb tool for specification of the high-latitude European sector and for the provision of data to initialise and constrain forecast models, with the potential ability to provide detailed real-time ionospheric maps of a region some hundreds of thousands of cubic kilometres in extent.
Even relatively poor data can be used to constrain the forecast, as they are optimally included into the filter.
In another study the levying of £9 billion of taxes is calculated to constrain the forecast growth in demand by 2030 to 315 million passengers, reducing the annual rate of growth to 2 per cent.
A constrained-forecast model shows a cap on VMTs and crash rates is achievable through policy that increases fuel prices, population density and annual transit passenger miles per capita at reasonable levels through a growth management approach.
There is uncertainty around weekly weather forecasts, but this is much more constrained than hurricane forecasts.
"We're still in the incipient stages of using these models to constrain our forecasts," Dr. McCreery said.
No. 2, the forecasting profession is constrained by the institution you're in.
Studies of combined forecasts have typically constrained the combining weights to sum to one and have not included a constant term in the combination.
Any choice based on averaging constrains the forecast speed to lie within the corresponding line ranges, constituting a suitable procedure; but this procedure may generate limitations.
Open image in new window Fig. 5 Time history of all matched patterns (left panel: the 231 time fragments of L11−12 and the current one right panel: evolutions of the 231 profiles into their future until 1 h ahead) Any choice based on averaging constrains the forecast speed to lie within the corresponding line ranges, constituting a suitable procedure; but this procedure may generate limitations.
Maintaining such a correspondence is necessary to understand how economic forecasts reflect, and are constrained by, relationships within the underlying physical system.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com