Re: st: drop duplicates iff

[Nick Cox <njcoxstata@gmail.com>]

Did you try looking at the documentation? There is a -duplicates-
command. Once you have used it to remove duplicates, the second
question is

bysort Apartment_ID : replace Bidder_ID = _n

Nick
njcoxstata@gmail.com


On 14 April 2013 23:19, Joel Jönsson <joensson.joel@gmail.com> wrote:
> Dear all Statalist users.
>
> I'm quit new to Stata and I'm facing the following challenge. I wish to get rid of duplicates within a
> variable (Bidder-ID) for a specific observation number (Apartment-ID) only i.e. there are numerous
> of observations with the value 49, 50, 51 etc. within Bidder-ID which are allowed only once
> within the same Apartment-ID.
>
> _n              Apartment-ID    Bidder-ID
>
> 1.              3345                    49
> 2.              3345                    49
> 3.              3345                    50
> 4.              3345                    51
> 5.              3345                    50
> 6.              5780                    49
> 7.              5780                    50
> 8.              5780                    49
>
> I would like the result to look something like the following:
>
> _n              Apartment-ID    Bidder-ID
> 1.              3345                    49
> 2.              3345                    50
> 3.              3345                    51
> 4.              5780                    49
> 5.              5780                    50
>
> Also, I wish to rename the observations in Bidder-ID (49,50,51) which could also take on numbers
> such as 2234, 2244, 2255 (they symbolize one unique bidder) to take on values equal to when they first
> appeared in Appartment-ID. So, if Bidder-ID 49, 50, 51, 2234, 2244, 2255 exist for the same
> Apartment-ID, then 49=1, 50=2, 51=3, 2234=4 etc., not necessarily in that order (2234=2, 51=1, 49=4 …).
>  Thus, It would look something like this:
>
>  _n             Apartment-ID    Bidder-ID
> 1.              3345                    1
> 2.              3345                    2
> 3.              3345                    3
> 4.              5780                    1
> 5.              5780                    2
>
> Thank you for your time.
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