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From |
Nick Cox <[email protected]> |

To |
[email protected] |

Subject |
Re: st: renaming variables from first observation |

Date |
Thu, 25 Aug 2011 11:04:27 +0100 |

Yes indeed. -strtoname()- arrived in Stata long after even the last update of -renvars-, but that doesn't rule out anything. renvars, map(strtoname(@[1])) would I guess be the recipe to try, or forval j = 1/14 { rename var`j' `=strtoname(var`j'[1])' } Nick On Thu, Aug 25, 2011 at 10:57 AM, Matthew White <[email protected]> wrote: > It'd create longer variable names, but maybe -strtoname()- is another option? On Thu, Aug 25, 2011 at 9:27 AM, Nick Cox <[email protected]> wrote: >> In fact, much of the last part of this to with -renvars- is a red >> herring. I was wondering exactly why my code with -renvars- worked; I >> just figured out that it was an accident in the original example in >> which buggy code gave the right answer for the wrong reason. >> >> Better code is >> >> renvars , map(word(@[1], 1)) >> >> This should be more transparent. The idiosyncratic detail is that @ is >> a placeholder for each variable name in turn. The recipe then is to >> use the first word of the value in the first observation. So for >> -var1- the new name would be the value of >> >> word(var1[1], 1) >> >> Nick >> >> On Thu, Aug 25, 2011 at 10:13 AM, Nick Cox <[email protected]> wrote: >>> Let's assume that your first values are all legal names. You could >>> indeed do this >>> >>> forval j = 1/14 { >>> local names `names' `=var`j'[1]' >>> } >>> renvars var1-var14 \ `names' >>> >>> But that's actually dozens of lines more code (look _inside_ -renvars-) than >>> >>> forval j = 1/14 { >>> rename var`j' `=var`j'[1]' >>> } >>> >>> and the second is in any case shorter and more direct, even without >>> looking inside -renvars-. >>> >>> You asked what a solution was with -renvars- and I agree that it looks >>> complicated. The -map()- option was mine and intended as an outlet for >>> the desperate user-programmer whose problem was not met by any of the >>> other options. But usually you need to be moderately fluent in Stata >>> to make effective use of it. The program was written for the authors' >>> use and any utility beyond that is a pleasant side-effect! >>> >>> `= exp' >>> >>> evaluates an expression on the fly and is documented tersely at -help >>> macro-. But the main idea is simple. Consider as part of a command >>> line >>> >>> `= 2 + 2' >>> >>> Stata sees ` ' and so expects something like a macro reference to be >>> substituted. But instead of a macro name there is >>> >>> = 2 + 2 >>> >>> Stata does the calculation on the fly. In this case the result is 4 >>> and that is what the command would see. >>> >>> -renvars- is over a decade old now. After that length of time >>> StataCorp caught up and the official -rename- is now much versatile in >>> Stata 12, although I doubt it has a way to solve your problem without >>> a loop. I would be happy to be shown wrong on that. >>> >>> Nick >>> >>> >>> On Thu, Aug 25, 2011 at 9:50 AM, Abhimanyu Arora >>> <[email protected]> wrote: >>>> Yes Nick, precisely, my values in the first observation were not >>>> legal. What I meant by storing values in a macro was something like a >>>> horizontal -levelsof- command. Once I obtain the values in a single >>>> macro I thought of simply using your and Jeroen Weesie's -renvars-. >>>> >>>> But the map option seems not that easy to understand, perhaps because >>>> I find `quotes' confusing sometimes. One needs to have a string >>>> expression in the parentheses while using the map option but I see >>>> that the expression in your example is in `quotes', normally used for >>>> macros. Would be really great if you could clarify this fundamental >>>> issue. >>>> >>>> Many thanks >>>> Abhimanyu >>>> >>>> >>>> . list in 1 >>>> >>>> +--------------------------------------------------------------------------------------------------------------------+ >>>> 1. | var1 | var2 | var3 | var4 | var5 >>>> | var6 | var7 | var8 | var9 | var10 | var11 | var12 | >>>> | Series Code | Series Name | Country Code | Country Name | 2000 >>>> | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | >>>> |---------------------------------------------------------+----------------------------------------------------------| >>>> | var13 | >>>> var14 | >>>> | 2008 | >>>> 2009 | >>>> +--------------------------------------------------------------------------------------------------------------------+ >>>> >>>> On Thu, Aug 25, 2011 at 10:35 AM, Nick Cox <[email protected]> wrote: >>>>> Already answered, but not correctly. You could e.g. use the first word >>>>> of the first value. This works: >>>>> >>>>> . l >>>>> >>>>> +------------------------------+ >>>>> | var1 var2 var3 | >>>>> |------------------------------| >>>>> 1. | Frog Toad Venomous snake | >>>>> 2. | 1 2 3 | >>>>> +------------------------------+ >>>>> >>>>> . renvars , map(`=word("@", 1)') >>>>> >>>>> . l >>>>> >>>>> +------------------------------+ >>>>> | Frog Toad Venomous | >>>>> |------------------------------| >>>>> 1. | Frog Toad Venomous snake | >>>>> 2. | 1 2 3 | >>>>> +------------------------------+ >>>>> >>>>> Nick >>>>> >>>>> On Thu, Aug 25, 2011 at 9:25 AM, Abhimanyu Arora >>>>> <[email protected]> wrote: >>>>>> I caught the mistake, thanks to -set trace on-. 'Code' is the second >>>>>> word of my observation of the first variable and of course a variable >>>>>> name has to be single worded. But my question on possibility of using >>>>>> Nick's -renvars- remains. >>>>>> Best regards >>>>>> Abhimanyu >>>>>> >>>>>> >>>>>> On Thu, Aug 25, 2011 at 10:07 AM, Abhimanyu Arora >>>>>> <[email protected]> wrote: >>>>>>> Good morning statalist >>>>>>> I would like to rename my variables var1-var14 to the corresponding >>>>>>> values from the first observation. >>>>>>> I followed the post on >>>>>>> http://www.stata.com/statalist/archive/2004-07/msg00009.html and >>>>>>> modified it for my purpose. >>>>>>> >>>>>>> but I got this error >>>>>>> >>>>>>> . forvalues k = 1/14 { >>>>>>> 2. local newname = var`k'[1] >>>>>>> 3. ren var`k' `newname' >>>>>>> 4. } >>>>>>> >>>>>>> Code not allowed >>>>>>> >>>>>>> Also is it posible to store the values of an observation in a macro? >>>>>>> Perhaps I could then use Nick Cox's -renvars-? >>>>>>> >>> >> >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/statalist/faq >> * http://www.ats.ucla.edu/stat/stata/ >> > > > > -- > Matthew White > Data Coordinator > Innovations for Poverty Action > 101 Whitney Avenue, New Haven, CT 06510 USA > www.poverty-action.org > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: renaming variables from first observation***From:*Abhimanyu Arora <[email protected]>

**References**:**st: renaming variables from first observation***From:*Abhimanyu Arora <[email protected]>

**Re: st: renaming variables from first observation***From:*Abhimanyu Arora <[email protected]>

**Re: st: renaming variables from first observation***From:*Nick Cox <[email protected]>

**Re: st: renaming variables from first observation***From:*Abhimanyu Arora <[email protected]>

**Re: st: renaming variables from first observation***From:*Nick Cox <[email protected]>

**Re: st: renaming variables from first observation***From:*Nick Cox <[email protected]>

**Re: st: renaming variables from first observation***From:*Matthew White <[email protected]>

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