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From |
"Dev Vencappa" <lexdvv@nottingham.ac.uk> |

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

Subject |
Re: st: manipulating part of a variable name. |

Date |
Mon, 05 Apr 2004 14:48:05 +0100 |

Dev >>> steichen@triad.rr.com 04/05/04 02:42pm >>> You can use the inline macro expansion operator `= as follows: local z "1986 1988 1990" foreach x of local z { gen XPRI3yr`x' = ( XPRI`x' - XPRI`=`x' - 2' ) } note that `x'-2 is enclosed with `= and ' Tom ----- Original Message ----- From: "Dev Vencappa" <lexdvv@nottingham.ac.uk> To: <statalist@hsphsun2.harvard.edu> Sent: Monday, April 05, 2004 9:13 AM Subject: Re: st: manipulating part of a variable name. > Stata users, I am stuck with a simple problem here. > I have variables called XPRI1984 XPRI1986 XPRI1988 XPRI1990, and so on. I want to ask stata to create a variable that computes a three-year difference (I count the first year as well) ie: > > gen XPRI3yr1986=XPRI1986-XPRI1984 > gen XPRI3yr1988=XPRI1988-XPRI1986 > > and so on. > > I want to put that in a loop and tried the following: > > local z "1986 1988 1990" > foreach x of local z{ > gen XPRI3yr`x'=(XPRI`x'-XPRI`x'-2) > } > > This is the bit I am stuck with. Is there a way of asking Stata to read the values of the variables that represent the previous two years values, i.e. XPRI`x'-2? > > I know what I have done above is incorect and think the solution is to ask stata to read the last four digits of the variable name, and use it as a numeric variable and hence the local will turn numeric,so that one can manipulate it in the way I did in my loop. I am not sure how to do that though. Please help > > Thanks in advance. > > Dev > > > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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