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Re: st: FW: Ranking a string variable


From   "Dimitriy V. Masterov" <dvmaster@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: FW: Ranking a string variable
Date   Mon, 23 Jan 2012 15:12:34 -0500

I think I see what you would like to do.

I would actually try "bysort department (time): gen rank=_n". That
will still sort the data by time within each department, but the rank
will only be calculated within the department.

I am afraid dropping time entirely will work as intended only long as
you sorted by time in a previous step.

DVM

On Mon, Jan 23, 2012 at 2:52 PM, Peci, Adriana (OAHPP)
<Adriana.Peci@oahpp.ca> wrote:
> Maybe I wasn't that clear but this is what I got after I run the "bysort department time: gen rank=_n" code.
> Ranking by time within the department instead of ranking by department and time at the same time.
>
> +-----------------------------------------------+
>      | department       time        item        rank |
>      |-----------------------------------------------|
> 4988. | 2270-2010-149   26 Dec 10   10C0835920      1 |
> 4989. | 2270-2010-149   26 Dec 10   10C0835921      2 |
> 4990. | 2270-2010-149   28 Dec 10   10C0835943      1 |
> 4991. | 2270-2010-149   28 Dec 10   10C0835944      2 |
> 4992. | 2270-2010-149   28 Dec 10   10C0835942      3 |
>      |-----------------------------------------------|
> 4993. | 2270-2010-149   28 Dec 10   10C0835945      4 |
> +-----------------------------------------------+
>
> After applying that I thought I was too close to the right solution.
> So I tried to sort by department and time first and then I run
> the "bysort department: gen rank=_n" code only. It seems that it worked.
>  +------------------------------------------------+
>      | department      time        item         rank2 |
>      |------------------------------------------------|
> 4988. | 2270-2010-149   26 Dec 10   10C0835920       1 |
> 4989. | 2270-2010-149   26 Dec 10   10C0835921       2 |
> 4990. | 2270-2010-149   28 Dec 10   10C0835944       3 |
> 4991. | 2270-2010-149   28 Dec 10   10C0835942       4 |
> 4992. | 2270-2010-149   28 Dec 10   10C0835943       5 |
>      |------------------------------------------------|
> 4993. | 2270-2010-149   28 Dec 10   10C0835945       6 |
>      +------------------------------------------------+
>
> Thank you so much for your help,
>
> Adriana
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Dimitriy V. Masterov
> Sent: January 23, 2012 1:21 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: FW: Ranking a string variable
>
> Does "bysort department time: gen rank=_n" do the trick?
>
> DVM
>
> On Mon, Jan 23, 2012 at 1:11 PM, Peci, Adriana (OAHPP)
> <Adriana.Peci@oahpp.ca> wrote:
>>
>> Hello stata listers,
>>
>> I need some help to rank a string variable by two other variables. My
>> data are in a long form in which one observation is listed more than
>> once.
>> The variable of interest is Item purchased  which I would like to rank
>> based on the Department that this item belongs to and
>> The time whern this item was purchased.
>> So if departments categories are A, B, C, D etc (string variable) which
>> are listed more than once in the database and the items are unique
>> values as  x, y, z,.(string variable) etc.
>> I want to count items of each department by purchased time as 1, 2, 3,
>> 4, 5. So in case of two items were purchased at the same time I want
>> them to be randomly ranked as 1, 2 and not 1,1.
>>
>> I am trying to use the egen command:  bysort department time: egen rank
>> =rank(item) but it doesn't work for a string variables.
>>
>> Can anyone help me with that ?
>>
>>
>> Thank you so much,
>>
>>
>> Adriana Peci
>>
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