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Re: st: Nostalgia for old example - bring back the bacon


From   "Allan Reese (Cefas)" <allan.reese@cefas.co.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Nostalgia for old example - bring back the bacon
Date   Fri, 1 Jul 2011 10:04:14 +0100

On Thu, Jun 30, 2011 at 12:24 PM, Allan Reese (Cefas) wrote:
>> There used to be an example in Stata books of an X-Y plot of the
annual
>> production of pig meat against the size of the stock on farms, points
>> connected in time sequence.  ...
>> Are there any other good examples of time-ordered connection as the
>> counterpoint to sorting by X?

Austin Nichols <austinnichols@gmail.com> provided the reference
> Stata 5, manual entry on graph twoway, p.167, 
and asked
> What do you mean by "good examples of time-ordered connection as the
counterpoint to sorting by X?"

Usually the command -scatter y x, c(l)- creates a jumble of lines unless
the data have been sorted on the X variable or the -sort- option is
added. [G, v11 p423] connect-options: "in general you want the point
sorted into ascending order of their x variable".  

The pig meat graph showed a cyclic pattern that you could interpret.
Apart from the vague reference to "special effects" (ibid) there is no
example now, and all line graphs in [G] appear to endorse the Excel
blinkering that connected line graph are only for when X=time.

Well done for keeping the V5 manuals - I haven't the shelf space, and
love PDF.

Allan


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