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Re: st: Formula/algorithm Stata uses to calculate default axis ranges and tick marks?


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Formula/algorithm Stata uses to calculate default axis ranges and tick marks?
Date   Sat, 6 Oct 2012 20:51:37 +0100

The methodology for nice numbers is broadly similar to that described in

STB-25  dm28  . . .  Calculate nice numbers for labeling or drawing grid lines
        (help nicenum if installed) . . . . . . . . . . . . . . . J. W. Hardin
        5/95    pp.2--3; STB Reprints Vol 5, pp.19--20

Otherwise I doubt that there is any on-line documentation of the kind you seek.

Nick

On Sat, Oct 6, 2012 at 7:46 PM, Michael Stepner
<michaelstepner@gmail.com> wrote:

> I'm trying to find a description of the formula or algorithm Stata
> uses to set the default look of a scatter plot's axes: how it chooses
> the default range and tick marks.  I've searched online and in the
> Stata manual, but haven't found any details.  I've read that Stata
> chooses approximately 5 "nice values" for the tick marks, but haven't
> found any indication of how those "nice values" are selected.
>
> If anyone could point me to a detailed description of the methodology
> for selecting the nice defaults, it would be greatly appreciated!
> Even if it's just pointing me to some code where these defaults are
> calculated and implemented, that would be a great help.
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