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From |
Joana Quina <[email protected]> |

To |
[email protected] |

Subject |
Re: st: RE: not uniquely identified observ in small panel |

Date |
Tue, 5 Jul 2005 22:22:31 +0100 |

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 > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**RE: st: RE: not uniquely identified observ in small panel***From:*"Nick Cox" <[email protected]>

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