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| From | Abhimanyu Arora <abhimanyu.arora1987@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: Creating a dummy variable under certain conditions |
| Date | Sun, 3 Jun 2012 20:24:33 +0200 |
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/