Add factors
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 Posts: 4
 Joined: Mon Jul 17, 2017 3:49 am
Add factors
I got the message: Overflow in "A31 equation" in "__KVARTSMODELLEN.ADDINIT(S=B, V=N) @ALL". What does it mean?
The A31 equation is "0*A31+... = ...+0.94748*A31+..." where the 0*A31 has been inserted on the left hand side of the equation (which was transported from a program system where the endogenous variable can be anywhere in the equation) in order to satisfy EViews requirement. That works fine for solving the model without add factors. Moving +0.94748*A31 from the right hand side to replace 0*A31 first on the left hand side removes the error message. Why?
The A31 equation is "0*A31+... = ...+0.94748*A31+..." where the 0*A31 has been inserted on the left hand side of the equation (which was transported from a program system where the endogenous variable can be anywhere in the equation) in order to satisfy EViews requirement. That works fine for solving the model without add factors. Moving +0.94748*A31 from the right hand side to replace 0*A31 first on the left hand side removes the error message. Why?

 Fe ddaethom, fe welon, fe amcangyfrifon
 Posts: 11851
 Joined: Tue Sep 16, 2008 5:38 pm
Re: Add factors
Overflow is caused by the model generating a number that is too large for the computer to handle. Usually due to logs (or rather inverting the log to exponentials).
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 Posts: 4
 Joined: Mon Jul 17, 2017 3:49 am
Re: Add factors
Why did the error message disappear when I rearranged the Equation as described in my first email?

 Fe ddaethom, fe welon, fe amcangyfrifon
 Posts: 11851
 Joined: Tue Sep 16, 2008 5:38 pm

 Posts: 368
 Joined: Fri Apr 15, 2011 5:35 am
Re: Add factors
Hi Gareth
When moving our macro model from TROLL to EViews we have to make EViews understand which variable that is to be treated as endogenous in each equation. For example, if we have the equation
y = 4*x + .2*y
and x is to be treated as the endogenous variable, EViews Chris reccommended that we just rewrite the equation as
0*x + y = 4*x + .2*y
see the post http://forums.eviews.com/viewtopic.php?f=10&t=9601&p=33688&hilit=troll#p33688.
Now it seems that this advice creates some problems with respect to initializations of add factors. To see this, run the commands
Which generates the error message:
If you however uncomment the line '_m.replace 3*log(x)=log(y), the addinit command works fine. This is what Dag illustrated in the example above. Is this something you can fix? If so, it would be highly appreciated.
Thomas
When moving our macro model from TROLL to EViews we have to make EViews understand which variable that is to be treated as endogenous in each equation. For example, if we have the equation
y = 4*x + .2*y
and x is to be treated as the endogenous variable, EViews Chris reccommended that we just rewrite the equation as
0*x + y = 4*x + .2*y
see the post http://forums.eviews.com/viewtopic.php?f=10&t=9601&p=33688&hilit=troll#p33688.
Now it seems that this advice creates some problems with respect to initializations of add factors. To see this, run the commands
Code: Select all
wfcreate u 100
genr x=50+0.03*@trend+2*nrnd
genr log(y)=3*log(x)+nrnd
model _m
_m.append 0*x+log(y)=3*log(x)
'_m.replace 3*log(x)=log(y)
_m.addassign(v) @all
_m.addinit(v=n) @all
Which generates the error message:
Overflow in "X equation" in "_M.ADDINIT(V=N) @ALL".
If you however uncomment the line '_m.replace 3*log(x)=log(y), the addinit command works fine. This is what Dag illustrated in the example above. Is this something you can fix? If so, it would be highly appreciated.
Thomas

 Fe ddaethom, fe welon, fe amcangyfrifon
 Posts: 11851
 Joined: Tue Sep 16, 2008 5:38 pm
Re: Add factors
I just ran that program 1,000 times and it didn't generate an error once...
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 Posts: 368
 Joined: Fri Apr 15, 2011 5:35 am
Re: Add factors
What kind of superpowers do you have?
The first picture is the error I get when running the program. I get the second error when I have the model
i.e., I change y=f(x) to x+y=f(x)+x, instead of 0*x+y=f(x).
I have EViews 10, Apr 3. 2018.
It is very strange that you cannot reproduce this... I have also attached a workfile. Try to run the command and you should get the error message in the second picture.
Thomas
The first picture is the error I get when running the program. I get the second error when I have the model
Code: Select all
_m.append x+log(y)=3*log(x)+x
i.e., I change y=f(x) to x+y=f(x)+x, instead of 0*x+y=f(x).
I have EViews 10, Apr 3. 2018.
It is very strange that you cannot reproduce this... I have also attached a workfile. Try to run the command
Code: Select all
_m.addinit(v=n) @all
Thomas
 Attachments

 _m.WF1
 (16.61 KiB) Downloaded 14 times

 Fe ddaethom, fe welon, fe amcangyfrifon
 Posts: 11851
 Joined: Tue Sep 16, 2008 5:38 pm
Re: Add factors
Yes, I get the error message on the posted workfile, but if I changed the models specification to:
the error goes away.
Code: Select all
0*x + log(y) = 3*log(x)
the error goes away.
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 Posts: 368
 Joined: Fri Apr 15, 2011 5:35 am
Re: Add factors
that is strange,
do you get an error if you run the command
on the attached workfile? In this case the model is: 0 * x + log(y) = 3 * log(x).
When I run it, I get:
Thomas
do you get an error if you run the command
Code: Select all
_m.addinit(v=n) @all
on the attached workfile? In this case the model is: 0 * x + log(y) = 3 * log(x).
When I run it, I get:
Thomas
 Attachments

 _m_overflow.WF1
 (16.62 KiB) Downloaded 17 times

 Fe ddaethom, fe welon, fe amcangyfrifon
 Posts: 11851
 Joined: Tue Sep 16, 2008 5:38 pm
Re: Add factors
No error.
Try deleting (or moving so you can move it back) your EViews ini file.
Try deleting (or moving so you can move it back) your EViews ini file.
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 Posts: 368
 Joined: Fri Apr 15, 2011 5:35 am
Re: Add factors
I moved the ini file and reopened EViews (EViews then created another ini file), but EViews still reports an error when running the program......
any other ideas about what is causing this error?
T
any other ideas about what is causing this error?
T
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