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Re: st: AW: forvalues & replace not working under two 'not equal to' conditions


From   joe j <joe.stata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: forvalues & replace not working under two 'not equal to' conditions
Date   Tue, 10 Nov 2009 18:08:15 +0100

Thanks. The last 4 columns (group_d; group_f; nongroup_d; nongroup_f)
are the final output variables. Their definitions are below the table.

******
contract_id; firm_id; nation_id; group_d; group_f; nongroup_d; nongroup_f
1	2	US	1	0	0	0
1	2	US	1	0	0	0
4	3	UK	0	1	0	0
4	3	US	0	1	0	0
8	3	US	0	0	1	1
8	4	UK	0	1	0	1
8	4	US	0	1	1	1
9	3	US	0	0	1	1
9	4	UK	0	0	0	1
9	5	US	0	0	1	1
10	4	CH	0	1	0	1
10	4	UK	0	1	0	1
10	5	US	1	0	0	1
10	5	US	1	0	0	1
10	6	NL	0	0	1	1
10	7	NL	0	0	1	1
******
1. group_d = 1 when both firm_id and nation_id are same for two or
more observations with the same contract id
2. group_f = 1  when firm_id is same but nation_id is different for
two or more observations with the same contract id
3. nongroup_d = 1  when firm_id is different but nation_id is same for
two or more observations with the same contract id
4 .nongroup_f = 1  when both firm_id and nation_id are different for
two or more observations with the same contract id


On Tue, Nov 10, 2009 at 5:47 PM, Martin Weiss <martin.weiss1@gmx.de> wrote:
>
> <>
>
>
> For clarification, you could provide the solution, i.e. the dummies that you
> actually want to see as your final output, for your chosen example. Makes it
> considerably easier to work towards code for you...
>
>
>
> HTH
> Martin
>
>
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von joe j
> Gesendet: Dienstag, 10. November 2009 17:39
> An: statalist@hsphsun2.harvard.edu
> Betreff: Re: st: AW: forvalues & replace not working under two 'not equal
> to' conditions
>
> Thanks Martin. I think I wasn't clear enough in the last mail. I was
> not looking at various combinations of firm_id, nation_id and
> contract_id 'for each observation'. Rather I was looking at the
> similarity or difference of firm_id/nation_id 'between two or more
> observations' under each contract_id.
>
> Based on Martin's suggestion I could derive group_d (see below). But I
> still can't get right nongroup_f, which equals 1 (for all
> observations) if firm_id and nation_id are different for two or more
> observations under each contract_id (but it takes a value 1, wrongly,
> for all observations in the data)
>
> *deriving group_d (this works)
> egen groups=group(firm_id nation_id)
>
> bys contract_id (groups):  /*
> */ gen byte distinctcount_group_d= /*
> */ (groups[_n]==groups[_n+1])
>
> bys contract_id (groups):  /*
> */ replace distinctcount_group_d=1 /*
> */ if (groups[_n]==groups[_n-1])
>
> *2 deriving nongroup_f doesnt work (e.g. it should be 0 for contract_id=1)
> bys contract_id (groups):  /*
> */ gen byte distinctcount_nongroup_f= /*
> */ (groups[_n]~=groups[_n+1]) & (nation_id[_n]~=nation_id[_n+1])
>
> bys contract_id (groups):  /*
> */ replace distinctcount_nongroup_f=1 /*
> */ if (groups[_n]~=groups[_n-1]) & (nation_id[_n]~=nation_id[_n-1])
>
> On Tue, Nov 10, 2009 at 4:14 PM, Martin Weiss <martin.weiss1@gmx.de> wrote:
>>
>> <>
>>
>> I think a variable denoting the combinations between the three ids is a
> good
>> place to start for you:
>>
>>
>>
>> *************
>> clear*
>> inp byte(contract_id firm_id) nation_id:mylabel, auto
>> 1   2   "US"
>> 1   2   "US"
>> 4   3   "UK"
>> 4   3   "US"
>> 8   4   "US"
>> 8   4   "UK"
>> 8   3   "US"
>> 9   5   "US"
>> 9   4   "UK"
>> 9   3   "US"
>> 10   5   "US"
>> 10   5   "US"
>> 10   6   "NL"
>> 10   7   "NL"
>> 10   4   "UK"
>> 10   4   "CH"
>> end
>>
>> egen groups=group(contract_id firm_id nation_id)
>>
>> l, sepby(con) noobs
>> *************
>>
>>
>>
>> HTH
>> Martin
>>
>>
>> -----Ursprüngliche Nachricht-----
>> Von: owner-statalist@hsphsun2.harvard.edu
>> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von joe j
>> Gesendet: Dienstag, 10. November 2009 16:04
>> An: statalist@hsphsun2.harvard.edu
>> Betreff: st: forvalues & replace not working under two 'not equal to'
>> conditions
>>
>> My dataset has three variables 1. contract_id, 2. firm_id and 3.
>> nation_id. I want to create 4 variables, each of which gets a value of
>> 1 if certain conditions are met. The variables I want to create are
>> specific to the contract id, and are:
>>
>> 1. group_d = 1 when both firm_id and nation_id are same for two or
>> more firms with the same contract id
>> 2. group_f = 1  when firm_id is same but nation_id is different for
>> two or more firms with the same contract id
>> 3. nongroup_d = 1  when firm_id is different but nation_id is same for
>> two or more firms with the same contract id
>> 4 .nongroup_f = 1  when both firm_id and nation_id are different for
>> two or more firms with the same contract id
>>
>> The following code works well for the first three variables, but not
>> for the last, nongroup_f; the value is 1 for all observations. I can't
>> figure out why.
>>
>> This is a sample code:
>>
>> clear
>> inp str10(contract_id firm_id   nation_id)
>> 1   2   "US"
>> 1   2   "US"
>> 4   3   "UK"
>> 4   3   "US"
>> 8   4   "US"
>> 8   4   "UK"
>> 8   3   "US"
>> 9   5   "US"
>> 9   4   "UK"
>> 9   3   "US"
>> 10   5   "US"
>> 10   5   "US"
>> 10   6   "NL"
>> 10   7   "NL"
>> 10   4   "UK"
>> 10   4   "CH"
>> end
>>
>>
>> *1.group_d . WORKS!
>> gen group_d=.
>> forvalues i=1/`=_N'{
>> bys contract_id: replace group_d=1 if firm_id==firm_id[_n-`i'] &
>> nation_id==nation_id[_n-`i']
>> }
>> forvalues i=1/`=_N'{
>> bys contract_id: replace group_d=1 if firm_id==firm_id[_n+`i'] &
>> nation_id==nation_id[_n+`i']
>> }
>>
>> *2.group_f  WORKS!
>> gen group_f=.
>> forvalues i=1/`=_N'{
>> bys contract_id: replace group_f=1 if firm_id==firm_id[_n-`i'] &
>> nation_id!=nation_id[_n-`i']
>> }
>> forvalues i=1/`=_N'{
>> bys contract_id: replace group_f=1 if firm_id==firm_id[_n+`i'] &
>> nation_id!=nation_id[_n+`i']
>> }
>>
>> *3. nongroup_d  WORKS!
>> gen nongroup_d=.
>> forvalues i=1/`=_N'{
>> bys contract_id: replace nongroup_d=1 if firm_id!=firm_id[_n-`i'] &
>> nation_id==nation_id[_n-`i']
>> }
>> forvalues i=1/`=_N'{
>> bys contract_id: replace nongroup_d=1 if firm_id!=firm_id[_n+`i'] &
>> nation_id==nation_id[_n+`i']
>> }
>>
>> *4.nongroup_f DOESN'T WORK!!
>> gen nongroup_f=.
>> forvalues i=1/`=_N'{
>> bys contract_id: replace nongroup_f=1 if (firm_id~=firm_id[_n-`i']) &
>> (nation_id~=nation_id[_n-`i'])
>> }
>> forvalues i=1/`=_N'{
>> bys contract_id: replace nongroup_f=1 if (firm_id~=firm_id[_n+`i']) &
>> (nation_id~=nation_id[_n+`i'])
>> }
>> *
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