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st: Dopping 1% observations, but numbers do not match


From   "Miguel Angel Duran" <maduran@uma.es>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Dopping 1% observations, but numbers do not match
Date   Wed, 10 Apr 2013 12:22:48 +0200

Will you please help me to know that what I am doing is right? To eliminate
outliers, I am trying to drop 1% of the observations with the lowest values.
To do so I use 'bysort entity (rcon1410a): drop if  rcon1410a[_N] <=
0.0388193'. Note that 'entity' is id, 'rcon1410a' is the relevant variable,
and 1% of the observations has a value that is lower than 0.0388193 (this
value is obtained from 'sum rcon1410a, detail'). Since I have 415,000
observations, I should be dropping 1%*415,000=4,150. Nevertheless, Stata
informs me that using the abovementioned command I have dropped 400
observations. Is this all right? Thanks in advance.

Miguel Angel.

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