Trailing moving population covariance (no d.f. adjustment; propagate NAs).
n-period trailing moving Pearson product moment population covariances between a pair of variables, with no d.f. correction, propagating NAs.
Syntax: @movcov(x, y, n)
x: series
y: series
n integer, series
Return: series
For each observation
and integer
, compute the population covariance () using the current and previous
observations of the series,
and propagating missing values (NAs).
If
n is not an integer, the integer floor
will be used.
Examples
show @movcov(x, y, 12)
produces a linked series of the moving population covariance of the series x and y where NAs are propagated.
Cross-references
See also
@movcor for moving correlation, and
@movcovp and
@movcovs for trailing moving covariances.
See
@mcov for NA-excluding version of this function.
