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Re: st: Float or Double?


From   Hind Sbihi <sbihi@interchange.ubc.ca>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Float or Double?
Date   Tue, 23 Oct 2007 20:33:52 -0700 (PDT)

Hello Michael

My understanding is that the general setting (parameters) are automatically set up when the variable is not new. So, when you type generate you are creating a new variable that will take on the type as declared in set type. However, the command replace does not create a new variable. The option nopromote prevents Stata from doing this.

HTH

Hind

-----Original Message-----

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