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# Re: st: limit to number of digits that can be precisely input into a Stata

 From "William Gould, StataCorp LP" To statalist@hsphsun2.harvard.edu Subject Re: st: limit to number of digits that can be precisely input into a Stata Date Tue, 15 May 2012 10:16:13 -0500

```David Beede asked,

> Is 15 the maximum number of digits one can [...] precisely[ ..]
> input into a Stata dataset using -insheet-?

The maximum value that can ber stored precisely is

9,007,199,254,740,992

or, without commas,

9007199254740992

There are 16 digits in the number, but 16-digit numbers greater
than 9,007,199,254,740,992 are rounded.

As Nick Cox <njcoxstata@gmail.com> mentioned, see
http://blog.stata.com/2012/04/02/the-penultimate-guide-to-precision/

9*10^15 would be pronounced as 9 quadrillion here in America
if we could remember how;  I had to look it up on Wikipedia.

We computer geeks would be more likely to say the number as
9 peta-something, as in "Joey has 9 peta-ducks".

I mention this as a way to help everyone remember the limit:  a little
over 9*10^15.  Here a "little" is a mere 7,199,254,740,992.

-- Bill
wgould@stata.com
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