From peter.summers@ttu.edu Thu Aug 12 16:42:07 2010
From: Summers, Peter <peter.summers@ttu.edu>
To: gretl-users@gretlml.univpm.it
Subject: Re: [Gretl-users] this is weird
Date: Thu, 12 Aug 2010 15:42:01 -0500
Message-ID: <8885DA157278484489B1EBC8B8C043E3FDC4DE13CD@COTTUS.ttu.edu>
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Many thanks, Allin!

-----Original Message-----
From: gretl-users-bounces(a)lists.wfu.edu [mailto:gretl-users-bounces(a)lists.wfu.edu] On Behalf Of Allin Cottrell
Sent: Thursday, August 12, 2010 3:26 PM
To: Gretl list
Subject: Re: [Gretl-users] this is weird

On Thu, 12 Aug 2010, Summers, Peter wrote:

> I'm estimating a series of regressions with varying break dates.
> I set up a script with the break dates in a vector, then
> generate a post-break dummy variable inside a loop, like so:
>
> <script>
> matrix breaks =  breaks = {1985; 1985; 1986; 1986; 1982; ...}
> loop ii=4..29
>     post = (obs>=obsnum(breaks[$ii-3]))
>     (run regression, do other stuff)
> end loop
> </script>

obsnum expects a string argument. This is related to the entry in
http://gretl.sourceforge.net/Backward.html for gretl 1.9.0.

The following will work (tested example):

<script>
open data3-6

matrix breaks = {1965, 1970, 1975}
string brkstr

loop ii=4..6
    sprintf brkstr "%d", breaks[ii-3]
    post = (obs >= obsnum(@brkstr))
    print post -o
end loop
</script>

Allin Cottrell
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