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RE: st: Errors in egen, total()
Dan's comment is on target. However, note that -recast- issued
retrospectively can do nothing by way of restoring lost precision. The
variable desired must be re-created using -egen- with -long- or -double-
specified explicitly.
Nick
[email protected]
Dan Blanchette
floats have about 7 digits of accuracy so I think that's what
you're running into with rev = 28536717
Here's the documentation on data types:
http://www.stata.com/help.cgi?datatype
Try:
. recast long rev
as long has up to 9 digits of accuracy.
> From: "Mike Kim" <[email protected]>
> I used "egen total()" to create "cumrev" like the following, but if
there is
> only one week per title, total gives a slightly lower number than the
> original number in some cases (1 or 2 lower). Any idea about why it
produces
> different numbers?
>
> bys title week: egen cumrev=total(rev)
>
> title week rev cumrev
> A 707 28536717 28536716
> A 708 10 30
> A 708 20 30
> B 801 .....
> ......
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