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st: byte mystery


From   Jeph Herrin <jherrin@flyingbuttress.net>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: byte mystery
Date   Tue, 01 Jun 2004 13:24:21 -0400

Hi all,
I've been using Stata a long time and never seen this.

. gen byte PCI=(initrs==4|initrs==5|initrs==6)
. gen byte hadPCI=PCI
. tab hadPCI

     hadPCI |      Freq.     Percent        Cum.
------------+-----------------------------------
       -128 |          2        0.00        0.00
          0 |    932,238       91.80       91.80
          1 |     83,218        8.20      100.00
------------+-----------------------------------
      Total |  1,015,458      100.00

Where does that -128 come from?

I am using Stata 8, latest updates, and I have run into this
problem with *three* different byte variables I generate using
this dataset; the only distinctive thing about the dataset is
it's size (>500MB). The problem is difficult to reproduce, as
well, so it's hard to figure out what is going on; for instance,
if I add a line that tabs the first variable (PCI) then there
is no trouble. I did try it without the "byte" designations, and
got the same spurious value.

Any ideas?

cheers,
Jeph


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