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Re: st: drop duplicates iff
From
Joel Jönsson <[email protected]>
To
[email protected]
Subject
Re: st: drop duplicates iff
Date
Mon, 15 Apr 2013 10:27:07 +0200
Thanks for your quick response Nick. I have been looking at the documentation (help duplicates).
My problem is to isolate the removal of duplicates to one Apartment-ID at the time. Which command [if] [in] [bysort] [group] do I use?
On Apr 15, 2013, at 1:48 AM, Nick Cox wrote:
> 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
> [email protected]
>
>
> On 14 April 2013 23:19, Joel Jönsson <[email protected]> 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.
>> *
>> * For searches and help try:
>> * http://www.stata.com/help.cgi?search
>> * http://www.stata.com/support/faqs/resources/statalist-faq/
>> * http://www.ats.ucla.edu/stat/stata/
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/faqs/resources/statalist-faq/
> * http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/