Variance and Covariance Surfaces for a Functional Data Object

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(fdx, fdy=fdx)

REQUIRED ARGUMENTS:

fdx
A univariate functional data object.

OPTIONAL ARGUMENTS:

fdy
A univariate functional data object.

VALUE:

A two-argument 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

EXAMPLES: