Message-ID: <749252685.2079285.1472517170479@mail.yahoo.com>
Date: 2016-08-30T00:32:50Z
From: Zibeli Aton
Subject: possible error in stem() function?
And thanks, Sarah, using scale=2 got me the sort of plot I was looking for. I agree the help is a bit thin on that function.
--------------------------------------------
On Mon, 8/29/16, Sarah Goslee <sarah.goslee at gmail.com> wrote:
Subject: Re: [R] possible error in stem() function?
Cc: "r-help" <r-help at r-project.org>
Date: Monday, August 29, 2016, 4:11 PM
The help isn't
particularly helpful, but you need to play with the
scale argument.
The range of
your first dataset is long enough that you're getting
only even-numbered stems by default.
Try these:
x1 <-
c(479,482,487,493,494,494,495,496,497,498,498,499,503,504,507,507,508,
510,511,512,514,516,520,524,525,525,527,534,536,542,545,546,547,549,
? ? ? ? ? ? ?
???557,559,561,561,563,563,567,568,569,570,572,578,584)
stem(x1, scale=1)
summary(x1)
stem(x1,
scale=2)
x2 <-
c(479,482,487,493,494,494,495,496,497,498,498,499,503,504,507,507,508,
510,511,512,514,516,520,524,525,525,527,534,536,542,545,546,547,549,
? ? ? ? ? ? ?
???557,559,561,561,563,563,567,568,569,570,572,578)
stem(x2, scale=1)
summary(x2)
stem(x2,
scale=2)
On Mon, Aug 29, 2016 at 1:42 PM, Zibeli Aton
via R-help
<r-help at r-project.org>
wrote:
> Using R-3.3.1 on Linux I seem to
sometimes get inaccurate stem-and-leaf plots using stem.?
For example:
>
>> x
<-
c(479,482,487,493,494,494,495,496,497,498,498,499,503,504,507,507,508,
> +? ? ? ? ? ? ?
???510,511,512,514,516,520,524,525,525,527,534,536,542,545,546,547,549,
> +? ? ? ? ? ? ?
???557,559,561,561,563,563,567,568,569,570,572,578,584)
>> stem(x)
>
>???The decimal point is 1
digit(s) to the right of the |
>
>???46 | 9
>???48 | 27344567889
>???50 | 3477801246
>???52 | 0455746
>???54 | 2567979
>???56 | 1133789028
>???58 | 4
>
> This plot is
inaccurate since there are no values 469, 483, 484, etc. in
the data.
>
> If I
remove one value from the input, then the result appears
correct:
>
>> x
<-
c(479,482,487,493,494,494,495,496,497,498,498,499,503,504,507,507,508,
> +? ? ? ? ? ? ?
???510,511,512,514,516,520,524,525,525,527,534,536,542,545,546,547,549,
> +? ? ? ? ? ? ?
???557,559,561,561,563,563,567,568,569,570,572,578)
>> stem(x)
>
>???The decimal point is 1
digit(s) to the right of the |
>
>???47 | 9
>???48 | 27
>???49 | 344567889
>???50 | 34778
>???51 | 01246
>???52 | 04557
>???53 | 46
>???54 | 25679
>???55 | 79
>???56 | 1133789
>???57 | 028
>
> Is there a limit to
the length of the input argument, a bug in the function, or
something I'm missing?
>
> Thanks.
>