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### rolling windows covariance matrix

Posted: **Tue Mar 31, 2015 10:14 pm**

by **fiyalee**

hi, i am trying to do rolling windows of covariance matrix

however, there seems to be only covariance matrix work....

and i have no idea about how to program rolling windows of covariance in the eviews..

does this work in the eviews?

thanks a lot

### Re: rolling windows covariance matrix

Posted: **Tue Mar 31, 2015 10:28 pm**

by **EViews Gareth**

How many series do you wish to find the covariance of?

### Re: rolling windows covariance matrix

Posted: **Wed Apr 01, 2015 2:25 am**

by **fiyalee**

hi ~

i have 50 stocks from 2003 to 2014 monthly data, totally 138 months

And i wish to have 60-month rolling windows size

thank you so much !!!

### Re: rolling windows covariance matrix

Posted: **Wed Apr 01, 2015 8:16 am**

by **EViews Gareth**

You'll have to program it with a for loop. There are plenty of examples of performing rolling regression on the forum, such as this one:

viewtopic.php?f=15&t=878Just change the code so that rather than estimating a regression and storing the coefficients, you calculate the covariance matrix and store that instead.

You'll want to put your series in a group, then do group.cov(out=myname)

### Re: rolling windows covariance matrix

Posted: **Sun Apr 05, 2015 7:55 am**

by **fiyalee**

hi,

it does help a lot!!!

thank you so much

### Re: rolling windows covariance matrix

Posted: **Wed Nov 02, 2016 4:06 pm**

by **grahan**

Hi, I have five series that I want to roll and save the covariance matrix in each period. Can you please help to perform it? The initial estimates of the covariance matrix is generated from DCC and ADCC, and not sure if rolling under DCC and ADCC framework is possible.

Also how to take sample variance-covariance of the residuals of the most recent rolling? Thank you very much.

### Re: rolling windows covariance matrix

Posted: **Sun Jan 22, 2017 2:51 am**

by **Charles_gre**

Hi All,

I have to do a lot of rolling regressions with Eviews 9. Thus I made a program which makes lots of rolling regressions all at once. As you know when one performs a rolling regression with the add-in.The estimation command is similar to the line shown hereunder:

ROLL(F,WINDOW=756,STEP=21)LU0568578776varitwo @ defaultLU0568578776.

This is a rolling regresion which has a fixed window, window size of 756 and a step size of 21. The estimtion command then continues with the name of the roll regression output which is "LU0568578776varitwo". This is followed by the name of equation which the rolling regression is to take as an specification which is an equation named " defaultLU0568578776".

I have created a program made up of about 200 command lines similar to the one indicated above.

THE PROBLEM IS THAT ALL THE ROLLING REGRESSION OUTPUT ARE ALL BEING SPECIFIED ON THE FIRST EQUATION THAT EVEIWS HAS IN ALPHABTHICAL ORDER. I have to make about 200 rolling regressions all based on different specification equations and not on the same one.

How come I write these commands:

ROLL(F,WINDOW=756,STEP=21)LU0568578776sp5variablesix @ sp5dLU0568578776

ROLL(F,WINDOW=756,STEP=21)IE00B01VC057sp5variablesix @ sp5dIE00B01VC057

ROLL(F,WINDOW=756,STEP=21)IE00B01VC164sp5variablesix @ sp5dIE00B01VC164

ROLL(F,WINDOW=756,STEP=21)LU0012202338sp5variablesix @ sp5dLU0012202338

ROLL(F,WINDOW=756,STEP=21)LU0085493038sp5variablesix @ sp5dLU0085493038

ROLL(F,WINDOW=756,STEP=21)LU0094547725sp5variablesix @ sp5dLU0094547725

ROLL(F,WINDOW=756,STEP=21)LU0119136876sp5variablesix @ sp5dLU0119136876

ROLL(F,WINDOW=756,STEP=21)LU0119137254sp5variablesix @ sp5dLU0119137254

ROLL(F,WINDOW=756,STEP=21)LU0119137338sp5variablesix @ sp5dLU0119137338

ROLL(F,WINDOW=756,STEP=21)LU0119137502sp5variablesix @ sp5dLU0119137502

and the rolling regression outputs have the same equation specification which is not the one specified in my commands?

They are all specied on Specification: DEFAULTFR0000018277 which is another equation.

How can I tell Eviews to please use the specification equation mentioned after the @ symbol?

I would apprecaite your help.

Thank you for reading.

### Re: rolling windows covariance matrix

Posted: **Sun Jan 22, 2017 4:55 pm**

by **EViews Gareth**

EViews doesn't have rolling regression built in.

### Re: rolling windows covariance matrix

Posted: **Mon Jan 23, 2017 2:01 am**

by **Charles_gre**

EViews Gareth wrote:EViews doesn't have rolling regression built in.

How can I perform lots of rolling regressions at one time?

With the add- in one can only perform one rolling regression at one time.

I have a lot of regressions which I need to roll over a fixed window size of 756 and a step size of 21.

### Re: rolling windows covariance matrix

Posted: **Mon Jan 23, 2017 9:18 am**

by **EViews Gareth**

You'll need to write a program to do it. You can look as the source code of the add-in, or use any of the many examples on the forum.