[Gretl-users] abs: where is the problem?

artur.tarasow artur.tarassow at googlemail.com
Mon Jun 29 18:35:46 EDT 2009


Hello,

I tried to program a little request which looks like:

script:
loop foreach i x y
    ols $i const time --quiet
    genr t_$i = $coeff(time)/$stderr(time)
    if t_$i < abs(1.97)
        adf 8 $i --c --test-down
   else
        adf 8 $i --ct --test-down
    endif
endloop
:end script

I define the request of the t-values as absolute values ( abs(1.97) ) 
but gretl does not consider this for negative ones. Though the t-value 
is e.g. -3.37 it does not take into account that the absolute value is 
bigger than 1.97. For positive t-values there is no problem.

Do you know what the problem is?

Cheers,
Artur



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