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From |
Michael Stewart <michaelstewartresearch@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Need help converting values into factor variable |

Date |
Sat, 1 Dec 2012 07:44:04 -0500 |

Dear Nick , I apologize for the mistake and not positng the code . I am trying to decipher the code written by you(sort, I am by no means and stata expert ) Can you explain what this code is doing; especially the argument ( sum(year != year[_n-1] & > inrange(year, 2009, 2012)) Thanks a lot Nick On Sat, Dec 1, 2012 at 7:17 AM, Nick Cox <njcoxstata@gmail.com> wrote: > This is not "Statlist"! > > You should show us your code that you tried to get an explanation of > what you are getting wrong. > > bysort patient (year) : gen flag = sum(year != year[_n-1] & > inrange(year, 2009, 2012)) > by patient : replace flag = flag[_N] > > Nick > > On Sat, Dec 1, 2012 at 11:55 AM, Michael Stewart > <michaelstewartresearch@gmail.com> wrote: > >> Dear Statlist reader , >> I am having trouble converting my values into factor variables and am >> looking for help. My data looks as follows where "patientid" is pt >> identification number and "year_elevated" is year in which a >> particular lab value was elevated >> >> >> patientid year_elevated >> 111 2009 >> 111 2009 >> 222 2009 >> 222 2011 >> 222 2012 >> 333 2009 >> 333 2012 >> 444 2011 >> 444 2012 >> 555 2009 >> 555 2010 >> 555 2011 >> 555 2012 >> >> I want to create a factor variable (y )with values 1= ,2 , 3 and 4 >> where for each distinct patientid >> y=1 if year_elevated has anyone of ( 2009 or 2010 or 2011 or 2012) values >> y=2 if year_elevated has any two of ( 2009 , 2010 , 2011 , 2012) values >> y=3 if year_elevated has any three of ( 2009 , 2010 , 2011 , 2012) values >> y=4 if year_elevated has all four of ( 2009 , 2010 , 2011 , 2012) values > * > * 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/ -- Thank you , Yours Sincerely, Mike. * * 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: Need help converting values into factor variable***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: Need help converting values into factor variable***From:*Michael Stewart <michaelstewartresearch@gmail.com>

**Re: st: Need help converting values into factor variable***From:*Nick Cox <njcoxstata@gmail.com>

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