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From |
Yuval Arbel <yuval.arbel@gmail.com> |

To |
statalist <statalist@hsphsun2.harvard.edu> |

Subject |
st: How to Calculate A Variable of Maximum Values up to each of the 114 periods in my sample? |

Date |
Fri, 14 Dec 2012 18:53:50 +0200 |

Dear Statalisters, I am trying to generate a variable, which will give me the maximum value of another variable (reduct_per) up to each of the 114 periods in my sample. Note that the function -max- works only with -egen-, namely it creates a constant maximum, and not a running maximum.. I therefore wrote the following set of commands: by appt: egen y=max(reduct_per) by appt: gen max=reduct_per if time_index==0 by appt: replace max=reduct_per if reduct_per==y by appt: replace max=reduct_per[_n-1] if reduct_per<=reduct_per[_n-1] & max==. & time_index==1 by appt: replace max=reduct_per if max==. & time_index==1 by appt: replace max=max[_n-1] if reduct_per<=max[_n-1] & max==. & time_index==2 by appt: replace max=reduct_per if max==. & time_index==2 by appt: replace max=max[_n-1] if reduct_per<=max[_n-1] & max==. & time_index==3 by appt: replace max=reduct_per if max==. & time_index==3 by appt: replace max=max[_n-1] if reduct_per<=max[_n-1] & max==. & time_index==4 by appt: replace max=reduct_per if max==. & time_index==4 by appt: replace max=max[_n-1] if reduct_per<=max[_n-1] & max==. & time_index==5 by appt: replace max=reduct_per if max==. & time_index==5 by appt: replace max=max[_n-1] if reduct_per<=max[_n-1] & max==. & time_index==6 by appt: replace max=reduct_per if max==. & time_index==6 and so on. My question is whether there is a more elegant way to generate this variable. More specifically I would like to know whether I need to write a loop, and if so how would I write it so that I don't have to repeat the last two commands for 114 periods -- Dr. Yuval Arbel School of Business Carmel Academic Center 4 Shaar Palmer Street, Haifa 33031, Israel e-mail1: yuval.arbel@carmel.ac.il e-mail2: yuval.arbel@gmail.com * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: How to Calculate A Variable of Maximum Values up to each of the 114 periods in my sample?***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: How to Calculate A Variable of Maximum Values up to each of the 114 periods in my sample?***From:*Ryan Kessler <ryan.kessler.stata@gmail.com>

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