Time varying standard deviation across variables

[RDS]

Consider three monthly time series Y, X and Z from January to August 2015.

I am interested in computing the monthly standard deviation among Y, X and Z and then plot the resulting time series.
It is a standard deviation among three numbers for each month.

How do you program it with Eviews 8? Best.

[EViews Gareth]

Put them in a group and then use the @rstdev function.

[RDS]

Thank you.

This provides the standard deviation based on a sample (i.e. N-1).

Is it possible to compute the standard deviation basen on the entire populations (i.e. N)?

[EViews Gareth]

A 5 second search in the documentation reveals:

2015-08-10_104306.png (27.11 KiB) Viewed 3262 times