What Is A Hierarchical Models? Hierarchical models, also known as hierarchical statistical models, multilevel models or random-effects models, are tools for analysing data with a nested or grouped ...

In terms of the length scale of structural features, material structure can be classified into macroscopic, mesoscopic, and microscopic structures. And the microscopic structure of materials can be ...

The degree of hierarchical structure of organisms-the number of levels of nesting of lower-level entities within higher-level individuals-has apparently increased a number of times in the history of ...