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Surrogate models are constructed using a data-driven, bottom-up approach. The exact, inner working of the simulation code is not assumed to be known (or even understood), relying solely on the input-output behavior. A model is constructed based on modeling the response of the simulator to a limited number of intelligently chosen data points.
A metamodel/ surrogate model is a model of the model, i.e. a simplified model of an actual model of a circuit, system, or software-like entity. [3][4] Metamodel can be a mathematical relation or algorithm representing input and output relations. A model is an abstraction of phenomena in the real world; a metamodel is yet another abstraction ...
Uncertainty quantification. Uncertainty quantification (UQ) is the science of quantitative characterization and estimation of uncertainties in both computational and real world applications. It tries to determine how likely certain outcomes are if some aspects of the system are not exactly known. An example would be to predict the acceleration ...
Surrogate data, sometimes known as analogous data, [1] usually refers to time series data that is produced using well-defined (linear) models like ARMA processes that reproduce various statistical properties like the autocorrelation structure of a measured data set. [2] The resulting surrogate data can then for example be used for testing for ...
Surrogate data testing[1] (or the method of surrogate data) is a statistical proof by contradiction technique similar to permutation tests [2] and parametric bootstrapping. It is used to detect non-linearity in a time series. [3] The technique involves specifying a null hypothesis describing a linear process and then generating several ...
Surrogate key. A surrogate key (or synthetic key, pseudokey, entity identifier, factless key, or technical key[citation needed]) in a database is a unique identifier for either an entity in the modeled world or an object in the database. The surrogate key is not derived from application data, unlike a natural (or business) key.
Gradient-enhanced kriging. Gradient-enhanced kriging (GEK) is a surrogate modeling technique used in engineering. A surrogate model (alternatively known as a metamodel, response surface or emulator) is a prediction of the output of an expensive computer code. [1] This prediction is based on a small number of evaluations of the expensive ...
Surrogate partner. Surrogate partners, formerly referred to as sex surrogates, are practitioners trained in addressing issues of intimacy and sexuality. A surrogate partner works in collaboration with a talk therapist to meet the goals of their client. This triadic model, composed of the client, talk therapist, and surrogate partner therapist ...