Re: st: RE: byte mystery

[Jeph Herrin <jherrin@flyingbuttress.net>]

Nick Cox wrote:

> Can you 
> . l if !inlist(hadPCI,0,1) 
Yep. Gives 2 records (too many vars to show output). But

. l hadPCI if !inlist(hadPCI,0,1)

         +--------+
         | hadPCI |
         |--------|
 471154. |   -128 |
 969426. |   -128 |
         +--------+

And - to reiterate -

. d hadPCI

              storage  display     value
variable name   type   format      label      variable label
-------------------------------------------------------------------------------
hadPCI          byte   %9.0g

Thanks,
Jeph










> Nick 
> n.j.cox@durham.ac.uk 
> Jeph Herrin
>
>
>
> > 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.
>
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