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st: RE: about centile and r(c_#)
From
"Nick Cox" <[email protected]>
To
<[email protected]>
Subject
st: RE: about centile and r(c_#)
Date
Wed, 7 Apr 2010 18:35:55 +0100
-centile- numbers its results 1, 2, etc. not in terms of the percents
you specified. Thus
. return list
will show that after your command r(c_1) and r(c_2) are specified.
r(c_30) would be specified only if you had asked for 30 or more
percentiles.
I guess this numbering convention is to avoid precision problems if
anyone asks for percentiles that do not correspond to integer percents.
Nick
[email protected]
G. Dai
I'm lit bit confused by centile. for example
************************
.clear
.sysuse auto
. centile price, c(30 60)
-- Binom. Interp.
--
Variable | Obs Percentile Centile [95% Conf.
Interval]
-------------+----------------------------------------------------------
---
price | 74 30 4424.5 4110.565
4679.134
| 60 5705 4912.708
6232.007
*************************
then I want to know the values of centiles, say
*****************************
. di r(c_30)
*****************************
I get missing values.
while
**************************
. di $S_7
4424.5
**********************
so, why r(c_30) doesn't work and why $S_7 works?
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