Variance and Covariance Surfaces for a Functional Data Object
var.fd
Language Reference for FDA Library

Variance and Covariance Surfaces for a Functional Data Object

DESCRIPTION:

Compute the variance and covariance functions for functional data. These are two-argument functions, and therefore define a surface. If there is one functional data object supplied, its variance is computed. If there are two, the covariance between the two is computed. Both functional data objects must be univariate.

USAGE:

var.fd(fdobj1, fdobj2=fdobj1)

REQUIRED ARGUMENTS:

fdobj1
a univariate functional data object.

OPTIONAL ARGUMENTS:

fdobj2
a univariate functional data object.

VALUE:

a two-argument or bivariate functional data object representing the variance surface for a single functional data object or the covariance between two functional data objects.

SEE ALSO:

mean.fd, std.fd, stddev.fd