Re: [Gretl-users] Number of valid observations.
On Tue, 13 Nov 2012, Mariusz Doszyń wrote:
Dear Gretl Useres!
I've 30 variables and want to generate vector (n) with number of valid
observations for each variable. I'm using 'ok' function but something is
wrong (see script below). Probably '$i' is not taken as an i-th variable
but as a series containg only "i". What do you think about it? How to be
sure that '$i' is taken as an i-th variable?
<hansl>
n=zeros(30,1)
loop i=1..30
a=sum(ok($i))
n[i,1]=a
endloop
print n
For a start, you may want to use the version nobs(), but that's very
marginal.
In order to do what you want, you have to supply the name of the series to
the function, not its number: you may do so in (at least) two ways.
Method 1:
<hansl>
open AWM.gdt
list L = CAN .. EER
n = zeros(nelem(L),1)
j = 1
loop foreach i L --quiet
n[j] = nobs($i)
j++
end loop
print n
</hansl>
Method 2:
<hansl>
open AWM.gdt
n = zeros(20,1)
loop i=1..20 --quiet
s = varname(i)
n[j] = nobs(@s)
end loop
print n
</hansl>
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Riccardo (Jack) Lucchetti
Dipartimento di Economia
Università Politecnica delle Marche
(formerly known as Università di Ancona)
r.lucchetti(a)univpm.it
http://www2.econ.univpm.it/servizi/hpp/lucchetti
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