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Re: st: xtlsdvc, initial(my)


From   "V. Sarafidis" <vs242@cam.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: xtlsdvc, initial(my)
Date   07 Sep 2005 17:27:55 +0100

I think the answer is that you don't need the estimate of the error variance. Only your initial vector of estimates (your estimate of the LDV coefficient needs to be firstfirst).

The reason it says
"the number of columns of my must be equal to the number of
right-hand variables plus one"

is because when you run xtlsdvc you do not put the lagged dependent variable in the model (so you type xtlsdvc y x , i(my) ). Therefore, you have 5 - say - regressors in your file plus the lagged dependent variable which the command xtlsdvc will create by itself.

I hope this helps

Vasilis

On Sep 7 2005, Miguel Portela wrote:


Dear all,

I am estimating a dynamic model using XTLSDVC. When I use the option
'initial(my)' I get

   "the number of columns of my must be equal to the number of
right-hand variables plus one"

'my' is a [1x(k+1)] matrix, which uses the results from a previous
regression and an estimate of the error variance

      mat my=e(b),evariance

I have checked with matrices of different dimensions, but the answer
is always the same. Could you please let me know if there is a
possible solution?

thanks in advance for your help,

cheers,

miguel


--
If I could get my membership fee back, I'd resign from the human race.
Fred Allen (1894 - 1956)


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