Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: st: Creating a dummy variable under certain conditions


From   sebas nicaise <sebasnicaise@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Creating a dummy variable under certain conditions
Date   Sun, 3 Jun 2012 18:59:50 +0000

Still not working :(

 

When I use this :

bys gvkey gen new_viol_dummy=L.gvkey+L2.gvkey+L3.gvkey+L4.gvkey==0


bys gvkey:replace new_viol_dummy=0 if new_viol_dummy[_n-1]==1


I get this:

date gvkey viol new_viol_dummy
1997q1 1004 0      0
1997q2 1004 0      0
1997q3 1004 0      0
1997q4 1004 0      0
1998q1 1004 0      1
1998q2 1004 0      0
1998q3 1004 0      1
1998q4 1004 0      0
1999q1 1004 0      1
1999q2 1004 0      0
1999q3 1004 0      1
1999q4 1004 0      0
2000q1 1004 0      1


 

 


Could you have another look at it :)?

 

 

 

 

 

 

> Date: Sun, 3 Jun 2012 20:24:33 +0200
> Subject: Re: st: Creating a dummy variable under certain conditions
> From: abhimanyu.arora1987@gmail.com
> To: statalist@hsphsun2.harvard.edu
>
> Now I see, you have an additional condition, Sebastian.
>
> In that case, you could simply add an additional command in addition
> to either Nick's or my solution with L. (not the F. one)
> -bys gvkey:replace new_viol_dummy=0 if new_viol_dummy[_n-1]==1
>
>
> date gvkey viol new_viol_dummy
> 1997q1 1004 0 0
> 1997q2 1004 0 0
> 1997q3 1004 0 0
> 1997q4 1004 0 0
> 1998q1 1004 0 0
> 1998q2 1004 0 0
> 1997q1 1021 0 0
> 1997q2 1021 0 0
> 1997q3 1021 0 0
> 1997q4 1021 0 0
> 1998q1 1021 0 0
> 1998q2 1021 0 0
> 1998q3 1021 0 0
> 1998q4 1021 1 1
> 1999q1 1021 1 0
> 1999q2 1021 1 0
> 1999q3 1021 1 0
> 1999q4 1021 0 0
>
>
>
>
> On Sun, Jun 3, 2012 at 7:46 PM, sebas nicaise <sebasnicaise@hotmail.com> wrote:
>> Dear Abhimanyu,
>>
>> This also does not give me the right answer.It gives:
>>
>> date gvkey viol new_viol_dummy1998q4 1095 0 01999q1 1095 0 01999q2 1095 0 01999q3 1095 0 01999q4 1095 1 02000q1 1095 0 02000q2 1095 1 12000q3 1095 1 12000q4 1095 1 12001q1 1095 1 12001q2 1095 1 12001q3 1095 1 0
>>
>> It should be:000010000000
>>
>> I think the command should be more complicated since the new viol dummy variable is only 1 under certain strict conditions.NEWVIOL is only 1 if the VIOL dummy of the corresponding GVKEY has a 1 IF in the four previous quarters a 0. Furthermore, if NEWVIOL documents a 1, it can only be a 1 again after four quarters of 0.
>>
>> Hope you, or someone else, can help me with this seemingly easy task :)
>>
>> Thank you,Sebastiaan
>> ----------------------------------------
>>> Date: Sat, 2 Jun 2012 17:21:54 +0200
>>> Subject: Re: st: Creating a dummy variable under certain conditions
>>> From: abhimanyu.arora1987@gmail.com
>>> To: statalist@hsphsun2.harvard.edu
>>>
>>> Okay, if I infer correctly, try this: bys gvkey: gen
>>> new_viol_dummy=viol+F1.viol+F2.viol+F3.viol==4.
>>> Seems good?
>>>
>>>
>>>
>>> On Sat, Jun 2, 2012 at 5:07 PM, sebas nicaise <sebasnicaise@hotmail.com> wrote:
>>>> Maybe I can better show it visually:
>>>> Your commands give me the following output:
>>>> bys gvkey: gen new_viol_dummy=L.viol+L2.viol+L3.viol+L4.viol==0
>>>> date gvkey viol new_viol_dummy 1997q1 1004 0 01997q2 1004 0 01997q3 1004 0 01997q4 1004 0 01998q1 1004 0 11998q2 1004 0 11997q1 1021 0 01997q2 1021 0 01997q3 1021 0 01997q4 1021 0 01998q1 1021 0 11998q2 1021 0 11998q3 1021 0 11998q4 1021 1 11999q1 1021 1 01999q2 1021 1 01999q3 1021 1 01999q4 1021 0 0
>>>> While I want this: date gvkey viol new_viol_dummy 1997q1 1004 0 01997q2 1004 0 01997q3 1004 0 01997q4 1004 0 01998q1 1004 0 01998q2 1004 0 01997q1 1021 0 01997q2 1021 0 01997q3 1021 0 01997q4 1021 0 01998q1 1021 0 01998q2 1021 0 01998q3 1021 0 01998q4 1021 1 11999q1 1021 1 01999q2 1021 1 01999q3 1021 1 01999q4 1021 0 0
>>>> If it is not clear what I mean, let me know :)
>>>> Thank you,Sebastiaan
>>>>> Date: Sat, 2 Jun 2012 16:34:41 +0200
>>>>> Subject: Re: st: Creating a dummy variable under certain conditions
>>>>> From: abhimanyu.arora1987@gmail.com
>>>>> To: statalist@hsphsun2.harvard.edu
>>>>>
>>>>> Sebas,
>>>>> Adding to Nick's comment, did you not -xtset- the data? You also have
>>>>> an option of bys id_var: command, otherwise
>>>>>
>>>>>
>>>>> On Sat, Jun 2, 2012 at 4:29 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>>>>>> You will probably want to exclude or ignore the first few observations
>>>>>> in each panel or -replace- it with missing. Otherwise, what's wrong?
>>>>>>
>>>>>> Abhimanyu's slip has already been corrected in this thread, as below.
>>>>>>
>>>>>> Nick
>>>>>>
>>>>>> On Sat, Jun 2, 2012 at 3:12 PM, sebas nicaise <sebasnicaise@hotmail.com> wrote:
>>>>>>
>>>>>>> Thank you for the quick replys.
>>>>>>>
>>>>>>> However, the suggested solutions did not give the right answer.
>>>>>>>
>>>>>>> Nick, your solution gives me way too many 1's. I do think the first step with the cusum was the right way to go.
>>>>>>>
>>>>>>> Abhimanyu, your solution does not distinquish between the id's, the calculation has to start over for every gvkey.
>>>>>>>
>>>>>>>
>>>>>>> Hope you can have another look at it, I will also try to work with the suggestions you gave me.
>>>>>>>
>>>>>>>> From: abhimanyu.arora1987@gmail.com
>>>>>>>> To: statalist@hsphsun2.harvard.edu
>>>>>>>>
>>>>>>>> Thanks Nick, yes.
>>>>>>>> But I would go for your solution which would be better in case he had
>>>>>>>> a longer lag.
>>>>>>>>
>>>>>>>> On Sat, Jun 2, 2012 at 2:56 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>>>>>>>>> This looks OK as long as you substitute -viol- for -gvkey-. The
>>>>>>>>> previous values concerned are for -viol-, not -gvkey-.
>>>>>>>>>
>>>>>>>>> Nick
>>>>>>>>>
>>>>>>>>> On Sat, Jun 2, 2012 at 1:51 PM, Abhimanyu Arora
>>>>>>>>> <abhimanyu.arora1987@gmail.com> wrote:
>>>>>>>>>
>>>>>>>>>> Try this if your data is -xtset-ted
>>>>>>>>>> gen new_viol_dummy=L.gvkey+L2.gvkey+L3.gvkey+L4.gvkey==0
>>>>>>>>>
>>>>>>>>>> On Sat, Jun 2, 2012 at 2:06 PM, sebas nicaise <sebasnicaise@hotmail.com>
>>>>>>>>>>
>>>>>>>>>>> I am struggeling with creating a new dummy variable. I have a very large
>>>>>>>>>>> (unbalanced) panel dataset that looks like this:
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> date gvkey viol
>>>>>>>>>>> 1997q1 1021 0
>>>>>>>>>>> 1997q2 1021 0
>>>>>>>>>>> 1997q3 1021 0
>>>>>>>>>>> 1997q4 1021 0
>>>>>>>>>>> 1998q1 1021 1
>>>>>>>>>>> 1998q2 1021 0
>>>>>>>>>>> 1998q3 1021 0
>>>>>>>>>>> 1998q4 1021 1
>>>>>>>>>>> 1999q1 1021 0
>>>>>>>>>>>
>>>>>>>>>>> 1999q2 1021 0
>>>>>>>>>>>
>>>>>>>>>>> 1999q3 1021 0
>>>>>>>>>>> 1999q2 1023 0
>>>>>>>>>>> 1999q3 1023 1
>>>>>>>>>>> 1999q4 1023 0
>>>>>>>>>>> 2000q1 1023 0
>>>>>>>>>>> 2000q2 1023 1
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> Where date is calender quarter, gvkey is the company identifier and viol a
>>>>>>>>>>> dummy which equals 1 if the firm is in violation of a covenant in a private
>>>>>>>>>>> debt contract.
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> The problem is that I have to create a new dummy variable ( new violation)
>>>>>>>>>>> which meets certain conditions.
>>>>>>>>>>>
>>>>>>>>>>> The new violation dummy is only allowed to be 1 if in the previous 4
>>>>>>>>>>> quarters of a certain company (gvkey) is 0.
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> This means for example that:
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> date gvkey viol Newviolation
>>>>>>>>>>> 1997q1 1021 0 0
>>>>>>>>>>> 1997q2 1021 0 0
>>>>>>>>>>> 1997q3 1021 0 0
>>>>>>>>>>> 1997q4 1021 0 0
>>>>>>>>>>> 1998q1 1021 1 1
>>>>>>>>>>> 1998q2 1021 0 0
>>>>>>>>>>> 1998q3 1021 0 0
>>>>>>>>>>> 1998q4 1021 1 0
>>>>>>>>>>> 1999q1 1021 0 0
>>>>>>>>>>>
>>>>>>>>>>> 1999q2 1021 0 0
>>>>>>>>>>>
>>>>>>>>>>> 1999q3 1021 0 0
>>>>>>>>>>> 1999q2 1023 0 0
>>>>>>>>>>> 1999q3 1023 1 0
>>>>>>>>>>> 1999q4 1023 0 0
>>>>>>>>>>> 2000q1 1023 0 0
>>>>>>>>>>> 2000q2 1023 1 0
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> I do not know how to tell Stata to create this variable, Hope someone is
>>>>>>>>>>> so kind to help me.
>>>>>>>>>
>>>>>>>>> *
>>>>>>>>> * For searches and help try:
>>>>>>>>> * http://www.stata.com/help.cgi?search
>>>>>>>>> * http://www.stata.com/support/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/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/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/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/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/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/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/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/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/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index