Re: Re: st: Regaining control over axis ranges

[Nick Cox <njcoxstata@gmail.com>]

Some ideas at

http://www.stata.com/support/faqs/graphics/scale-breaks/

Nick

On Fri, Dec 28, 2012 at 10:24 AM, annoporci <annoporci@gmail.com> wrote:
> This is not a pressing issue at all, but I'd like to consign here for the
> record and in case someone is interested and/or knows how to deal with it.
>
>
> A short while ago I asked:
>
>
>>>>> I'm trying to shorten the y axis of a graph.
>
>
> and Nick suggested the solution of omitting data with the -if- and
> -inrange- options:
>
>        sysuse ibm,clear
>        twoway scatter ibm date if inrange(ibm,-1,+1)
>
> This solution worked well and satisfied me until I experimented with
> connected lines instead of scatter points. The -if inrange()- solution
> omits the data, with the result that connecting the remaining data is
> misleading, especially in a time series context:
>
>        sysuse ibm,clear
>        twoway scatter ibm date if inrange(ibm,-1,+1), connect(line)
> /// similar thing using tsset:
>        tsset date
>        twoway tsline ibm if inrange(ibm,-1,+1)
>
> What do I mean by "misleading"? well suppose your data is usually between -1
> and 1 but on one occasion (e.g. Black Monday) it is something like -5. If
> you include the outlier, the rest of the data will look very flattened and
> the graph won't be informative. If you omit the outlier, the rest of the
> data will be spread over a greater area and look much clearer but connecting
> the dots will give the impression that the outlier isn't there at all (since
> it is omitted).
>
> This is a situation where I would like to be able to "shorten the y axis"
> (my initial query), as in "zooming" and slicing through connected lines,
> neither omitting the data nor showing it.
>
>
> --
> Patrick Toche.
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