Basic Rolling Regression
Moderators: EViews Gareth, EViews Moderator

 EViews Developer
 Posts: 149
 Joined: Fri Sep 03, 2010 7:57 am
Re: Basic Rolling Regression
You can make a storage vector/matrix before doing the loop (e.g. vector(!nrolls) RMSE) and store RMSE values in the loop.
Re: Basic Rolling Regression
Thanks again Esther!
When I try to change the equation with more variables, I think the error means I need to change the number after the coefs in the sentence below, but I am not sure how many I shud put there to replace the "!"? or should not to replace it but add sth else?
Please see screen shot!
Thanks
When I try to change the equation with more variables, I think the error means I need to change the number after the coefs in the sentence below, but I am not sure how many I shud put there to replace the "!"? or should not to replace it but add sth else?
Please see screen shot!
Thanks
Code: Select all
' estimate equation  where the equation is P =c(1) + c(2)naturalgas +c(3)coal+c(4)wool+c(5)qcmid
eq1.ls usdaud c naturalgas coal wool qcmid
' store coefficients
colplace(coefmat,eq1.@coefs,!j)
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 EViews Developer
 Posts: 149
 Joined: Fri Sep 03, 2010 7:57 am
Re: Basic Rolling Regression
This is because the storage matrix was set to be 2by!nrolls. Now the number of coefficients is 5 so that we need to change the storage matrix size.
Re: Basic Rolling Regression
Code: Select all
' estimate equation  where the equation is P =c(1) + c(2)naturalgas +c(3)coal+c(4)wool+c(5)qcmid
eq1.ls usdaud c naturalgas coal wool qcmid
' store coefficients
colplace(coefmat,eq1.@coefs,5x5j)
Hi Esther,
Please see if I can change the "!" to "5x5"? or please could you let me know how should I amend this?
Many thanks!
Re: Basic Rolling Regression
Thank you for this thread! It is so much easier to get into rolling regression and forecasting by examples.
It works fine, but if i log my dependent variable, i get the error message: "Overflow in "DO_EQ1.Forecast(F=NA) yf".
The forecast for the last period (doing 1 step forecasts) misses. But as far as i can see the results are correct.
It works fine, but if i log my dependent variable, i get the error message: "Overflow in "DO_EQ1.Forecast(F=NA) yf".
The forecast for the last period (doing 1 step forecasts) misses. But as far as i can see the results are correct.
Re: Basic Rolling Regression
EViews Esther wrote:The difference between start (%1pers) and end (%1pere) points should be 1 so that you can write the program as follows:Code: Select all
' 1periodahead forecast
%1pers = @otod(@dtoo(%start)+!i+!window1) 'start point
%1pere = @otod(@dtoo(%start)+!i+!window) 'end point
Hi Esther,
is this really a oneperiodahead forecast?
if i continue the row you mentioned before, this should be a 2period ahead forecast, and thats what i get if i compute the forecasts.
4period end point: %4pere  %4pers +1 = 4 > 2  (1) + 1 = 4
3period end point: %3pere  %3pers +1 = 3 > 1  (1) + 1 = 3
2period end point: %2pere  %2pers +1 = 2 > 0  (1) + 1 = 2
1period end point: %1pere  %1pers +1 = 1 > 1  (1) + 1 = 1
If i compute it manually I get the same results.
I have got another question regarding exogenous variables: How can I tell Eviews that it should include (out of fit sample) exogenous variables into the forecasts and exclude endogenous variable values (use estimated values instead) ? Is this what "(f=arg) does?
Does anybody have a solution for the log problem from above?
Re: Basic Rolling Regression
EViews Esther wrote:Code: Select all
' set sample for estimation period
%first = @otod(@dtoo(%start)+!i1)
%last = @otod(@dtoo(%start)+!i+!window2)
smpl {%first} {%last}
' estimate equation  where the equation is P =c(1) + c(2)*P1(1)
eq1.ls usdaud c usoil
' store coefficients
colplace(coefmat,eq1.@coefs,!j)
d(noerr) yf
Hello, Eviews staff. I was trying to make a rolling regression for estimating the coefficients of an Ar(1) process, trying to reproduce the programming of Esther, but i can't seem to pull it off. Here is the quote of the line of code that doesn't seem to work for me. Specifically, my Eviews says that "smpl {%first} {%last}" are invalid dates, and i don't really know what to do about it. Please help me! Thank you in advance.
PS: I may have managed to screw it up in more ways than here, but this is the only line that stops me due to an error warning. Im terribly lost and due time for my disertation is running fast! please help me!

 Posts: 1
 Joined: Sat Dec 31, 2011 10:04 pm
Re: Basic Rolling Regression
Hi
I ran Rolling Reg addin in EViews 8 and rand into this error:
I thought maybe it couldn't handle parentheses or other signs but when I took those nonletter symbols away, it only fix it with for variables. So, I'm not sure what the problem is now.
Help would be greatly appreciated. Thank you.
Have a nice day.
I ran Rolling Reg addin in EViews 8 and rand into this error:
I thought maybe it couldn't handle parentheses or other signs but when I took those nonletter symbols away, it only fix it with for variables. So, I'm not sure what the problem is now.
Help would be greatly appreciated. Thank you.
Have a nice day.
Re: Basic Rolling Regression
I run the 4periodahead program and only change the number of variables to 4. My sample is from 1996M01 to 2013M09, then it comes out a window says :2013M09 is an illegal or reserved name in "IF 2013M09<1997M12 THEN". Could anyone help me to solve this problem! Many thanks!

 Fe ddaethom, fe welon, fe amcangyfrifon
 Posts: 11844
 Joined: Tue Sep 16, 2008 5:38 pm
Re: Basic Rolling Regression
I run the 4periodahead program and only change the number of variables to 4. My sample is from 1996M01 to 2013M09, then it comes out a window says :2013M09 is an illegal or reserved name in "IF 2013M09<1997M12 THEN". This is my code following previous post. Would you help check the problem? Thanks!
Code: Select all
'run rolling regression
' set window size
!window = 20
' set step size
!step = 1
' get size of workfile
!length = @obsrange
' declare equation for estimation
equation eq1
'calculate number of rolls
!nrolls = @floor((!length!window)/!step)
'matrix to store coefficient estimates
matrix(4,!nrolls) coefmat ' where 4 is the number of coefficients
'series to store forecast estimates
series fcast
'redundant series for catching start and end points
series ser = 1
%start = @otod(@ifirst(ser))
%end = @otod(@ilast(ser))
'variable keeping track of how many rolls we've done
!j=0
' move sample !step obs at a time
for !i = 1 to !length!window+1!step step !step
!j=!j+1
' set sample for estimation period
%first = @otod(@dtoo(%start)+!i1)
%last = @otod(@dtoo(%start)+!i+!window2)
smpl {%first} {%last}
' estimate equation  where the equation is y=c(1)+c(2)*x1+c(3)*x2+c(4)*x3
eq1.ls lqt c idt ygdt pidt
' store coefficients
colplace(coefmat,eq1.@coefs,!j)
' 4periodahead forecast
%4pers = @otod(@dtoo(%start)+!i+!window1) 'start point
%4pere = @otod(@dtoo(%start)+!i+!window+2) 'end point: %4pere  %4pers +1 = 4
if {%end} < {%4pere} then 'check whether the forecast end point is greater than the workfile end point
return
endif
' set smpl for forecasting period
smpl {%4pers} {%4pere}
' forecast with command *forecast* (see also *fit*)
eq1.forecast(f=na) yf
' set sampl to obtain the 4th period observation
smpl {%4pere} {%4pere}
' store forecasts
fcast = yf
next
smpl @all
show coefmat
show fcast.line
d(noerr) ser
Re: Basic Rolling Regression
I do the rolling regression by the following code and it works well. But a problem is that the report equation is the last coeffecient matrix. For example, my sample is from 1996M012013M09, then the report equation is from 2008M122013M01. See below. Can I use the coeffecient from the report equation or should I use an average coeffecient from the reported 'coefmat'. Or the code could be changed a little to report an average coeffecient matrix and other statistics. Thanks for your time!
Code: Select all
'run rolling regression
' set window size
!window =50
' set step size
!step =5
' get size of workfile
!length = @obsrange
' declare equation for estimation
equation eq1
'calculate number of rolls
!nrolls = @round((!length!window)/!step)
'matrix to store coefficient estimates
matrix(4,!nrolls) coefmat ' where 4 is the number of coefficients
'variable keeping track of how many rolls we've done
!j=0
' move sample !step obs at a time
for !i = 1 to !length!window+1!step step !step
!j=!j+1
' set sample to estimation period
smpl @first+!i1 @first+!i+!window2
' estimate equation  where the equation is y=c(1)+ c(2)*x1 + c(3)*x2+c(4)*x3
eq1.ls lqt c idt ygdt pidt
'store coefficients
colplace(coefmat,eq1.@coefs,!j)
next
show coefmat

 Fe ddaethom, fe welon, fe amcangyfrifon
 Posts: 11844
 Joined: Tue Sep 16, 2008 5:38 pm
Re: Basic Rolling Regression
EViews Gareth wrote:What do you want to use?
oh i get it. the different coeffecients can be graphed in a figure.Is that right?
Re: Basic Rolling Regression
EViews Gareth wrote:What do you want to use?
I want to report each coeffecient matrix and its statistics under each subsample.
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