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st: inconsistent behavior of -ds-


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: inconsistent behavior of -ds-
Date   Wed, 6 Sep 2006 20:47:11 -0400

Caleb said

To illustrate what appears to be inconsistent behavior of -ds-, consider
this dataset with 9 string variables:

. desc

Contains data from uniondemoc82-3.dta
obs: 180
vars: 10
size: 40,500 (99.9% of memory free)
------------------------------------------------------------------------ -------
storage display value
variable name type format label variable label
------------------------------------------------------------------------ -------
union str80 %80s
id int %8.0g
pres1 str20 %20s
treas1 str17 %17s
sect1 str20 %20s
sect2 str16 %16s
st1 str20 %20s
st2 str16 %16s
st3 str11 %11s
vp1 str19 %19s

. ds
union id pres1 treas1 sect1 sect2 st1 st2 st3
vp1

. ds , has(type string)
union pres1 treas1 sect1 sect2 st1 st2 st3 vp1

. ds, has(type 2/8)

. ds , has(type 2/62)
pres1 treas1 sect1 sect2 st1 st2 st3 vp1

. ds , has(type 2/11)
st3



Looks perfectly consistent with -help ds- to me. ds without arguments -> all variables, ok. ds with type string, all but id, ok. has(type 2/8) is shorthand for str2,...str8, of which you have none, ok. has (type 2/62) includes all string variables except union, ok. has(type 2/11) includes only st3, ok. So far ds appears to be batting 1.000. What is inconsistent here?

Kit Baum, Boston College Economics
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html


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