Thanks.
. duplicates list id year
did indicate duplicates. I have corrected them and everything is
working fine now.
Joana
On 05/07/05, Nick Cox <[email protected]> wrote:
> I see no bug here, but only what -duplicates- was
> intended to do.
>
> -duplicates- reports that you have 128 observations,
> which are all unique (that is, there is just 1 copy of each
> observation).
>
> If -duplicates- found any duplicates,
> they would exist as 2 or more copies of each other.
>
> There is more explanation at [R] duplicates.
>
> So -duplicates report- and -duplicates list- are
> reporting consistent results.
>
> Your problem is perhaps best investigated by asking
>
> . duplicates list id year
>
> Nick
> [email protected]
>
> Joana Quina
>
> > Thanks for replying. I am sorry for the mix up - I was using "width"
> > with "xtdes" and not with "duplicates".
> >
> > Here is what I typed and the output:
> >
> > . duplicates report
> >
> > Duplicates in terms of all variables
> >
> > --------------------------------------
> > copies | observations surplus
> > ----------+---------------------------
> > 1 | 128 0
> > --------------------------------------
> >
> > . duplicates list
> >
> > Duplicates in terms of all variables
> >
> > (0 observations are duplicates)
> >
> > . iis id
> >
> > . tis year
> >
> > . xtdes
> >
> > id: 1, 2, ..., 32
> > n = 32
> > year: 1, 2, ..., 4
> > T = 4
> > Delta(year) = 1; (4-1)+1 = 4
> > (id*year does not uniquely identify observations)
> >
> > Distribution of T_i: min 5% 25% 50%
> > 75% 95% max
> > 2 4 4 4
> > 4 5 5
> >
> > Freq. Percent Cum. | Pattern
> > ---------------------------+---------
> > 29 90.63 90.63 | 1111
> > 1 3.13 93.75 | 1..1
> > 1 3.13 96.88 | 1121
> > 1 3.13 100.00 | 1211
> > ---------------------------+---------
> > 32 100.00 | XXXX
> >
> > . xtdes , width(200)
> > option width() not allowed
> > r(198);
>
> > On 05/07/05, Nick Cox <[email protected]> wrote:
> > > I am interested in your assertion that -duplicates-
> > > produces an incorrect result. But to say anything
> > > about it would require a sight of exactly what you
> > > typed and exactly what results you got, and/or a copy of the
> > > data, which you might care to send to me privately.
> > >
> > > I wasn't aware that -duplicates- had a -width()- option.
> > >
> > > Nick
> > > [email protected]
> > >
> > > Joana Quina
> > >
> > > > My problem is that -xtdes- says my two key variables do
> > not together
> > > > uniquely identify the cases in my large panel data set. I
> > am working
> > > > with a small panel (N=32 and T=4).
> > > >
> > > > I have no duplicates, though "duplicates report" wrongly
> > says I have
> > > > one dupliacate observation. Curiously, "duplicates list" correctly
> > > > says I have none.
> > > > This appears to have happened to the only other query I
> > could find on
> > > > this subject. I have tried changing width, but stata says "option
> > > > width() not allowed".
> > > >
> > > > I don't know what else to do. It seems quite a ridiculous
> > problem for
> > > > such a small data set! Thank you in advance for any pointers.
> > > >
> > > > Joana
> > > >
> > > > PS - I have Stata 8
>
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>
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