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From |
n j cox <[email protected]> |

To |
[email protected] |

Subject |
Re: st: programming graphs in stata |

Date |
Tue, 16 Oct 2007 21:15:55 +0100 |

Programming graphs in Stata is just programming with -graph-

in Stata, as from Stata 8. Perhaps Matthias has been focusing

on other software, or in some Rip Van Winkle state, in the

interim.

Matthias asks about -gph-. -gph- is still there and it would

have one possible advantage over -graph- (speed), but I can

think of absolutely no other reason to use it. While

-gph- was visible it was slightly popular for some graphics

programming, because it gave you total control, but as soon as

Stata 8 came out I believe that everyone who had been using -gph- abandoned it without regret, because you needed to re-create

everything (even axis ticks, axis labels, etc.).

With -graph-, my own experience is that almost all graphics

programming calls for -twoway- calls. This applies even --

indeed especially -- if your graph doesn't possess x and

y axes. You still use -twoway- and then suppress the axes.

On spineplots, snap! I've picked up my pen, or rather opened

up Stata, to think about writing a spineplot program about

three times, and got no further than thinking a little

about strategy. The crucial detail appears to be is that

-twoway bar- doesn't let you vary bar width. Thus you

would, so far as I can see, need to superimpose as many

distinct -twoway bar-s as there were distinct bar widths,

and probably more (because you might want some that were

otherwise different). That sounds like a bad idea. Thus

I am led to surmise that you would be better off, for any

program with pretensions to generality, with something like

-twoway area-. It must be possible, but it doesn't

sound quite trivial, unless I'm missing some trick.

I hope you make progress on the idea. Spine plots are the

acceptable face of mosaic plots, in my view.

Nick

[email protected]

Schonlau, Matthias

For programming new graphs in stata, Stata 7 offered the command "gph".

This is still available under version control, but I believe the use of

gph at this point is discouraged. (Right?)

I am particularly interested in creating spine plots. These are plots

similar to barcharts, but with the width proportional to frequency (and

constant height). Barcharts work just the other way around.

What options do I have to program new graphs?

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**Follow-Ups**:**Re: st: programming graphs in stata***From:*Maarten buis <[email protected]>

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