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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 08:01:56 -0500 |

Thank you nick On Sat, Dec 1, 2012 at 7:53 AM, Nick Cox <njcoxstata@gmail.com> wrote: > sum() create running sum (see -help sum()-) > > year != year[_n-1] year not equal to previous year > expression evaluated as 1 if true and 0 if false > > see > FAQ . . . . . . . . . . . . . . . . . . . . . . . True and false in Stata > . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox > 2/03 What is true and false in Stata? > http://www.stata.com/support/faqs/data-management/true-and-false/ > > This works also for the _first_ observation for each patient as the > previous year is then evaluated as missing (which is fine; missing is > not any of 2009 ... 2012) > > inrange(year, 2009, 2012) year in range 2009 to 2012 (may be > superfluous if you _don't_ have other years -- but you did not say > that) > > Nick > > On Sat, Dec 1, 2012 at 12:44 PM, Michael Stewart > <michaelstewartresearch@gmail.com> wrote: > >> 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)) > > 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/

**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>

**Re: 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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