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| 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 17:46:08 +0000 |
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/