The point is NOT to pick the prettiest; the point is
that if the apparent results differ by number of bins
or by bandwidth, etc., then you should not be presenting
any such graph at all.
Rich
"R. Allan Reese" wrote:
>
> WAS Re: st: Histograms (was: Multiple (overlaid) Histogram)
>
> On Thu, 29 May 2003, Richard Goldstein wrote:
> > For any graphic command that has an option such
> > as bin (histogram), bwidth (lowess), width (kdensity),
> > I would very much like to see dynamic graphics -- i.e.,
> > a slider such that I can change
>
> I'm undecided at present, but see dangers in this suggestion, the main one
> being that Stata could (like other software) grow into a ragbag of
> uncoordinated features with no philosophy. I hold to the advantages of a
> command-based system for serious data analysis (as compared to "the
> computer printed this number so it must be right"). Dynamic graphics are
> like a random walk: you may find a pretty view, but does that make it
> meaningful? If there is some objective measure to optimize, should that
> not be built into the program? If not, it is a design decision.
>
> The case for a slider for bin width seems weak, in that it is a continuous
> scale that would have to be monitored and converted into a decision to
> change the display from k to k-1 or k+1 bins. As Nick has pointed out, the
> sequence of plots can be generated with a loop, and could be assembled on
> a single screen for "pick the prettiest". The shape might also be
> sensitive to the centering of the bins - would you use two sliders in
> concert?
>
> DataDesk has an alternative philosophy, based on linking observations
> between related dynamic graphics. A news report yesterday suggested that
> playing computer games is beneficial - they help develop hand-eye
> coordination, concentration and attention to detail. I think a similar
> argument could be advanced for any occupation taken seriously:
> bird-watching or stamp collecting. Certainly DataDesk can be used well
> and can give insights during data analysis, but equally, I suspect, it can
> be used as a surrogate for thinking. Fiddling with screen objects is the
> modern equivalent of rearranging the pens on your desk when stuck for
> inspiration.
>
> Allan
> R. Allan Reese Email: [email protected]
> Associate Manager GRI Direct voice: +44 1482 466845
> Graduate School Voice messages: +44 1482 466844
> Hull University, Hull HU6 7RX, UK. Fax: +44 1482 466436
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