Fobserved
fobserved is a term used in statistics and data analysis to denote the value of a predefined function f evaluated on the observed data. It serves as a tangible summary statistic that can be contrasted with a reference or expected value derived from a model or from simulated data. If D_obs represents the observed dataset and f: D -> R is a chosen statistic or function, then fobserved = f(D_obs).
In practice, fobserved is often compared to a reference distribution to assess model fit or to test
Examples of fobserved include common statistics such as the residual sum of squares in regression, the absolute
Relation to fexpected and related concepts: In many frameworks, fexpected denotes the model-based expectation of f
Limitations should be noted: the meaning of fobserved depends on the specification of f and the underlying