Notice: On March 31, it was **announced** that Statalist is moving from an email list to a **forum**. The old list will shut down on April 23, and its replacement, **statalist.org** is already up and running.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

From |
Kyle Peyton <kyle.peyton@unimelb.edu.au> |

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

Subject |
Re: st: Identifying complicated varlist for foreach loop |

Date |
Sat, 16 Jul 2011 04:01:03 +0000 |

Thanks Nick, that did the trick! On 15/07/2011, at 1:07 PM, "Nick Cox" <njcoxstata@gmail.com> wrote: > unab vvars: v* > foreach v of local vvars { > local stub = substr("'v",2,.) > local stubs 'stubs' 'stub' > } > > is one way to do it, it being understood that ' ' should really be left single quote and right single quote. > > Nick > > > > > On 15 Jul 2011, at 02:45, Kyle Peyton <kyle.peyton@unimelb.edu.au> wrote: > >> Hi all, >> >> I have a very large dataset with some variables that I suspect have matching observations. I want to test this expectation and eliminate superfluous variables. >> >> Essentially, I have two groups. In group 1, all variables have a prefix of "v". So we might have Vpen, Vshirt, Vfrog, etc. Let's assume I have 100 variables in group 1, all of them having this prefix "v" >> >> In group 2, I have approximately 250 variables. Of those 250 variables, 100 variables are the same as those in group 1, minus the prefix. The other 150 I am certain are different. So we would have pen, shirt and frog, etc. My expectation (hope) is that this is the case and then I will be able to simply drop the variables with the "v" prefix from my dataset. >> >> Is there a way to identify the SUFFIX of everything with a v PREFIX and then define that as a list? Then I'm thinking I can create a loop along these lines: >> >> Foreach x in varlist (this is the varlist of my 100 important variables, my non-prefixed pens and frogs, etc.) >> Assert `x' = v`x' (assuming this RHS works !) >> >> This could be the completely wrong logic, however. > * > * 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/

**References**:**st: Identifying complicated varlist for foreach loop***From:*Kyle Peyton <kyle.peyton@unimelb.edu.au>

**Re: st: Identifying complicated varlist for foreach loop***From:*Nick Cox <njcoxstata@gmail.com>

- Prev by Date:
**Re: st: Backward Selection (AIC) with xtmixed** - Next by Date:
**st: DHS Womens Data Survey Setup** - Previous by thread:
**Re: st: Identifying complicated varlist for foreach loop** - Next by thread:
**st: full length variable labels as matrix row names** - Index(es):