Structural equation modeling (SEM) encompasses such diverse statistical techniques as path analysis, confirmatory factor analysis, causal modeling with latent variables, and even analysis of variance ...

Sometimes ecological data just don’t make sense. The sockeye salmon that spawn in British Columbia’s Fraser River offer a prime example. Scientists have tracked the fishery there since 1948, through ...

Complex natural systems defy standard mathematical analysis, so one ecologist is throwing out the equations. Sometimes ecological data just don’t make sense. The sockeye salmon that spawn in British ...

Computational models and simulations have had an important role in engineering analysis since as far back as the 1960s. It is widely recognized that the use of modeling and simulation tools can make ...

A closed-loop drilling system, to be effective, requires reliable two-way communication between the downhole module and surface. 1 2 Today's drilling industry uses mud-pressure pulse telemetry as one ...

A new mathematical model estimates the water content in saturated natural gas, both sweet and sour, up to 10,000 psia and 460° F. For designing processing units and piping systems, one needs to ...