You are of course correct. Thanks!
Nick
[email protected]
Scott Merryman
> There is a "noiytick" suboption for by() :
>
> twoway scatter rep78 mpg, by(foreign, noiytick)
>
> Another way, rather than reducing the length to zero, would
> be to remove the
> color of the ticks:
>
> twoway scatter rep78 mpg, ylabel(, tlcolor(none)) by(foreign)
Nick Cox
> > Here is a tip I thought I would pass on. On a -twoway-
> > plot, whenever an axis shows a categorical variable,
> > I often want to suppress the ticks, which to me
> > convey the impression of marks on a numerical scale.
> > A simple example is
> >
> > sysuse auto, clear
> > scatter rep78 mpg, by(foreign)
> >
> > If you want to suppress the ticks for -rep78-,
> > then the mind springs towards
> >
> > scatter rep78 mpg, by(foreign) yla(, notick)
> >
> > but this does not do what you hope it will, as
> > the -notick- has no effect.
> >
> > I owe to Vince Wiggins an assurance that there is
> > a good explanation for this rooted in the way that
> > graphs using -by()- are put together, although it is
> > evidently too subtle to be easily explained.
> >
> > He patiently pointed out to me that working at the code
> > to make this possible is hardly essential, given the
> > possible work-around
> >
> > scatter rep78 mpg, by(foreign) yla(, tlength(0))
> >
> > which perhaps struck you immediately as the solution.
> >
> > There is no doubt some subtle quasi-philosophical
> > distinction between no tick and a tick of zero length,
> > but they look pretty similar to me.
> >
> > So that's it then: -tlength(0)- is a way to suppress
> > ticks when more obvious methods fail.
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