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st: -numlabel- and -vreverse-


From   "Renzo Comolli" <renzo.comolli@yale.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: -numlabel- and -vreverse-
Date   Sat, 30 Aug 2003 16:46:46 -0400

Dear Nick and Statalist

On 
http://www.stata.com/statalist/archive/2003-08/msg00582.html
Nick Cox writes "It is the user's responsibility to consider whether the
copied variable label and characteristics
also apply."

In particular I want to draw the attention to the interaction between
-numlabel- and -vreverse-
If you first -numlabel label, add- and after -vreverse varname,
generate(newvar)-, then the numbers in the lables will be wrong for newvar.
The -vreverse- generates a new lable with the same name as newvar, to my
(very modest) experience it is not possible to subsequently remove the
numbers from the new lable.

So (at the moment) the best way to do what people want, assuming they want
the right lables on both the original variable and the new variable, seems
to me to be 
-numlabel label, remove- -vreverse varname, generate(newvar)- -numlabel
label, add- -numlabel newlabel, add-

Renzo Comolli


E.g.

. sysuse auto, clear
(1978 Automobile Data)

. numlabel origin, add

. tab foreign

   Car type |      Freq.     Percent        Cum.
------------+-----------------------------------
0. Domestic |         52       70.27       70.27
 1. Foreign |         22       29.73      100.00
------------+-----------------------------------
      Total |         74      100.00

. tab foreign, nola

   Car type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         52       70.27       70.27
          1 |         22       29.73      100.00
------------+-----------------------------------
      Total |         74      100.00

. vreverse foreign, generate(Foreign)

. tab Foreign

   Car type |      Freq.     Percent        Cum.
------------+-----------------------------------
 1. Foreign |         22       29.73       29.73
0. Domestic |         52       70.27      100.00
------------+-----------------------------------
      Total |         74      100.00

. tab Foreign, nola

   Car type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         22       29.73       29.73
          1 |         52       70.27      100.00
------------+-----------------------------------
      Total |         74      100.00

. d

Contains data from C:\STATA8\ado\base/a/auto.dta
  obs:            74                          1978 Automobile Data
 vars:            13                          3 Oct 2002 13:53
 size:         3,552 (99.9% of memory free)
----------------------------------------------------------------------------
---
              storage  display     value
variable name   type   format      label      variable label
----------------------------------------------------------------------------
---
make            str18  %-18s                  Make and Model
price           int    %8.0gc                 Price
mpg             int    %8.0g                  Mileage (mpg)
rep78           int    %8.0g                  Repair Record 1978
headroom        float  %6.1f                  Headroom (in.)
trunk           int    %8.0g                  Trunk space (cu. ft.)
weight          int    %8.0gc                 Weight (lbs.)
length          int    %8.0g                  Length (in.)
turn            int    %8.0g                  Turn Circle (ft.) 
displacement    int    %8.0g                  Displacement (cu. in.)
gear_ratio      float  %6.2f                  Gear Ratio
foreign         byte   %11.0g      origin     Car type
Foreign         byte   %11.0g      Foreign    Car type
----------------------------------------------------------------------------
---
Sorted by:  foreign  
     Note:  dataset has changed since last saved

. numlabel  Foreign, remove
(no value label to be modified)

. numlabel  Foreign, remove force
(no value label to be modified)

. numlabel  Foreign, add

. tab Foreign

      Car type |      Freq.     Percent        Cum.
---------------+-----------------------------------
 0. 1. Foreign |         22       29.73       29.73
1. 0. Domestic |         52       70.27      100.00
---------------+-----------------------------------
         Total |         74      100.00


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