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


From   "William Gould, StataCorp LP" <wgould@stata.com>
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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