[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

From |
"E. Paul Wileyto" <epw@mail.med.upenn.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Selecting stubnames for -reshape- / macrolists |

Date |
Mon, 30 Jun 2008 10:54:06 -0400 |

I have the following implemented as an ADO. It is what I use to grab all the name stubs for reshaping. You will want to make sure that if your subscripts all look like _1, _2, _3... that you only use one of them. Grabbing *_* will give the same stubname many times.

Paul

program define namelist

***********************************************************************

***********************************************************************

* This short program helps you define a list (global macro vlist)

* of variable name roots to aid in scripting and especially reshaping.

*

* Feel free to use wildcards in varlist. Be sure that you are only

* generating the same root once.

*

* The oldsub option describes the common subscript in the the list.

* The newsub option describes the truncated subscript to be used in

* reshaping.

* * For example: Variables rx30a_s1..rx30a_s20 all have the common root

* rx30a_s, with a numerical subscript for the repetition. To extract a

* list of roots for all survey entries, use:

*

* -namelist rx*_s1, oldsub(_s1) newsub(_s)

*

***********************************************************************

***********************************************************************

syntax varlist, [oldsub(string) newsub(string)]

global vlist "`varlist'"

if "`oldsub'" > "" & "`newsub'" > "" {

global vlist : subinstr local varlist "`oldsub'" "`newsub'" , all

}

noisily ma list vlist

end

pr9@duke.edu wrote:

.--

My question is whether there is a clever way to identify the stubnames

for a -reshape-. Consider this example:

sysuse auto, clear

foreach j in 1 2 3 4 5 {

gen x_`j'=rep78+`j'

gen y_`j'=rep78-`j'

}

drop y_3

gen id=_n

keep id x_* y_*

/*

This data-set contains the following variables which I want to -reshape-:

x_1 x_2 x_3 x_4 x_5

y_1 y_2 y_4 y_5

I want to -reshape- by stubnames x_ and y_.

In my "real" data-set, I know that all variables I want to end up with

as stubnames contain an underscore (_). They all also do contain numbers

after the underscore, but there is no regular pattern there.

Now, I am generating a -macrolist- with unique stubnames, but this seems

like a detour to me, especially the loop:

*/

ds *_*

foreach v in `r(varlist)' {

local f `=regexr("`v'","[0-9]+","")'

local n `n' `f'

local n: list uniq n

}

di "*** `n' ****"

reshape long `n', i(id) j(foo)

Two questions:

1) Is there a better way to identify stubnames for a -reshape-?

2) Is there a more straightforward way to arrive at a unique macrolist

than the one I chose? In particular, something like the -regexr()-

function, but with the ability to remove all instances (not just the

first) of the regular expression. Something like -subinstr()-, but for

regular expressions.

Thank you!

Philipp

*

* 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/

Privileged, confidential or patient identifiable information may be contained in this message. This information is meant only for the use of the intended recipients. If you are not the intended recipient, or if the message has been addressed to you in error, do not read, disclose, reproduce, distribute, disseminate or otherwise use this transmission. Instead, please notify the sender by reply e-mail, and then destroy all copies of the message and any attachments.

*

* 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/

E. Paul Wileyto, Ph.D.

Assistant Professor of Biostatistics

Tobacco Use Research Center

School of Medicine, U. of Pennsylvania

3535 Market Street, Suite 4100

Philadelphia, PA 19104-3309

215-746-7147

Fax: 215-746-7140

epw@mail.med.upenn.edu

http://mail.med.upenn.edu/~epw/

*

* 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/

**Follow-Ups**:**Re: st: Selecting stubnames for -reshape- / macrolists***From:*Philipp Rehm <philipp.rehm@gmx.de>

**References**:**st: Selecting stubnames for -reshape- / macrolists***From:*"pr9@duke.edu" <pr9@duke.edu>

- Prev by Date:
**st: Selecting stubnames for -reshape- / macrolists** - Next by Date:
**st: Percent correctly predicted after Asclogit or Clogit** - Previous by thread:
**st: Selecting stubnames for -reshape- / macrolists** - Next by thread:
**Re: st: Selecting stubnames for -reshape- / macrolists** - Index(es):

© Copyright 1996–2015 StataCorp LP | Terms of use | Privacy | Contact us | What's new | Site index |