levelsof variable，local （A）
levelsof 提取了variable下面每一个值，然后local把这些值统一在A的集合下面
. use tv1,clear
. des
Contains data from tv1.dta
Observations: 10
Variables: 6 28 Dec 2009 12:10
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Variable Storage Display Value
name type format label Variable label
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kidid float %5.0f ID
dt float %d date of observation
female float %6.0f is kid female?
wt float %4.0f weight of kid
tv float %4.0f tv watching (in hours)
vac float %4.0f is kid on vacation?
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Sorted by:
. levelsof dt ,local(a)
15347 15348 15350 15351 15353 15356 15358 15359 15361 15362
. levelsof female ,local(b)
0 1
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