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Re: st: Scatterplot jitters - bug? (v12/Win used)
From
"Allan Reese (Cefas)" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Scatterplot jitters - bug? (v12/Win used)
Date
Wed, 26 Jun 2013 14:30:55 +0000
In the example below, the points at (5 35.2) are jittered, and only (5 50.2) are plotted coincident. You raise a good philosophical question: when jitter is requested, should the program extract the plotting ranges from the jittered data or the "true" values? Also puzzling, I thought jitter added a random amount to each value, but repeated calls appear to give the same graph for this example, and -set seed- is also not changing the jittered plot.
Allan
PS: I assume you mean the Stata multiverse.
Date: Mon, 24 Jun 2013 15:10:10 +0100
From: Nick Cox <[email protected]>
Fair point, but somewhere in the Stata universe there is also an
anti-Allan who would regard it as a bug if data points were jittered
to outside the plot region.
On 24 June 2013 14:03, Allan Reese (Cefas) <[email protected]> wrote:
> Here's an irritating "feature" that I would term a bug, in that the results are not as per documentation and are counter-intuitive. It seems that coincident points at the top-right limit of the plotted area are not jittered. Here's a little, real, dataset and two examples to compare. Point at (5 50.2) are not jittered in the first plot.
>
> . list y x, sep(0)
>
> +----------+
> | y x |
> |----------|
> 1. | 0 44.7 |
> 2. | 0 44.7 |
> 3. | 0 44.7 |
> 4. | 0 39.9 |
> 5. | 1 39.9 |
> 6. | 0 39.9 |
> 7. | 3 35.2 |
> 8. | 5 35.2 |
> 9. | 5 35.2 |
> 10. | 5 50.2 |
> 11. | 5 50.2 |
> 12. | 3 50.2 |
> +----------+
>
> . scatter y x, jitter(5)
>
> . scatter y x, jitter(5) yscale( range(0 5.2))
>
> Allan
>
>
>
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