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st: RE: RE: Rare bug/feature in -graph,ylog-


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: Rare bug/feature in -graph,ylog-
Date   Mon, 4 Nov 2002 14:52:27 -0000

Fixing an inequality in my previous posting: 

> This certainly looks like a bug,
> but Stata is only trying its best...
> 
> How does it arise? Here is my surmise.
> 
> When Stata is -- in effect -- asked to
> plot a constant on one graph axis, how
> it is supposed to choose upper and lower
> limits for the axis -- if given no information to
> determine that by -?la()- or -?sc()-?
> 
> The adhockery used is that Stata tries to add
> 1 to and subtract 1 from the constant.
> However, whenever the lower limit
> would be < 0 this clashes with any prescription

           <= 0 

> of a logarithmic scale.
> 
> Hence my guess is that this arises whenever
> the constant is <= 1, not quite Roger's
> diagnosis.

Nick
n.j.cox@durham.ac.uk

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