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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Sat, 1 Dec 2012 12:17:26 +0000 |

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/

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

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

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