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st: Float or Double?


From   "Michael Mitchell" <mnm@ucla.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Float or Double?
Date   Tue, 23 Oct 2007 17:09:25 -0700

Greetings

  While showing someone the merits of "set type double", I encountered
the strangest thing. After entering "set type double", new non-integer
variables created via "generate" are created as doubles, but
non-integer variables created via "replace" are created as floats. For
example...

. desc

Contains data from hsb2.dta
  obs:           200                          highschool and beyond (200
                                                cases)
 vars:            11                          6 Feb 2007 12:41
 size:         3,200 (99.9% of memory free)
-------------------------------------------------------------------------------
              storage  display     value
variable name   type   format      label      variable label
-------------------------------------------------------------------------------
id              int    %9.0g
-------------------------------------------------------------------------------
Sorted by:

. set type double
. generate id2 = id / 5
. replace id = id / 5
id was int now float
(200 real changes made)

. desc

Contains data from hsb2.dta
  obs:           200                          highschool and beyond (200
                                                cases)
 vars:            12                          6 Feb 2007 12:41
 size:         5,200 (99.9% of memory free)
-------------------------------------------------------------------------------
              storage  display     value
variable name   type   format      label      variable label
-------------------------------------------------------------------------------
id              float  %9.0g
id2             double %10.0g
-------------------------------------------------------------------------------
Sorted by:
     Note:  dataset has changed since last saved

  Shouldn't both "id" and "id2" both be double?

Michael Mitchell
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