Variograms and covariance functions are the fundamental tools for
modeling dependent data observed over time, space, or space-time.
This paper aims at constructing nonseparable spatio-temporal
variograms and covariance models. Special attention is paid to an
intrinsically stationary spatio-temporal random field whose
covariance function is of Schoenberg-Lévy type. The correlation
structure is studied for its increment process and for its partial
derivative with respect to the time lag, as well as for the
superposition over time of a stationary spatio-temporal random
field. As another approach, we investigate the permissibility
of the linear combination of certain
separable spatio-temporal covariance functions to
be a valid covariance, and obtain a
subclass of stationary spatio-temporal models isotropic in space.
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