Jeph Herrin <[email protected]> wrote:
> 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?
This output looks very odd. -128 should not even be a possible byte value.
There are several things that could be causing this problem, including bad
memory on a system, a corrupted dataset, etc.
I would recommend that you contact Stata Technical Support at
[email protected] so that we can try to figure out if there is a way for
us to reproduce the problem here.
--Shannon Driver
[email protected]
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