Computes a variance estimate for hwtos2
Merely takes a wavelet periodogram (actually wd class
object), and a level argument. Then extracts the wavelet periodogram
coefficients at that level and returns twice the mean of their
squares.
Usage
littlevar(WP, ll)
Value
Twice the mean of the square of the coefficients at the level
extracted.
Arguments
WP
The wavelet periodogram that you wish to analyze (actually
a wd class object, type="station"
ll
A valid level for the periodogram
Author
Guy Nason.
References
Nason, G.P. (2013) A test for second-order stationarity and
approximate confidence intervals for localized autocovariances
for locally stationary time series. J. R. Statist. Soc. B,
75, 879-904.
tools:::Rd_expr_doi("10.1111/rssb.12015")