Andy Jacobson wrote:>
> Howdy,
>
> Should summary() print answers with different numbers of
> significant figures, as in the following?
>
> > dim(iv)
> [1] 3000 2
> > summary(iv)
> X1 X2
> Min. :-4.15261 Min. :-3.271520
> 1st Qu.:-0.66188 1st Qu.:-0.671205
> Median : 0.01233 Median :-0.008175
> Mean : 0.01121 Mean : 0.016815
> 3rd Qu.: 0.67778 3rd Qu.: 0.715284
> Max. : 3.73594 Max. : 3.691423
> > summary(iv[,1])
> Min. 1st Qu. Median Mean 3rd Qu. Max.
> -4.15300 -0.66190 0.01233 0.01121 0.67780 3.73600
> > summary(iv[,2])
> Min. 1st Qu. Median Mean 3rd Qu. Max.
> -3.272000 -0.671200 -0.008175 0.016820 0.715300 3.691000
I assume iv is a data.frame [summary.data.frame() will be used], while
iv[,i] are vectors [summary.default() will be used].
>From ?summary:
summary.default(object, ..., digits = max(3, getOption("digits")-3))
summary.data.frame(object, maxsum = 7,
digits = max(3, getOption("digits")-3), ...)
Without having changed the default of options("digits"),
in summary() is digits = 7-3 (=4) in both cases.
Again from ?summary:
digits - integer, used for number formatting with signif()
(for summary.default)
or format() (for summary.data.frame).
And that's the big difference! Have also a look at ?signif and ?format.
Uwe Ligges
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