[Rd] "stem" does not give a correct answer (PR#9359)
Berwin A Turlach
berwin at maths.uwa.edu.au
Mon Nov 13 07:16:18 CET 2006
G' day Myung,
>>>>> "MGK" == mgkim <mgkim at seowon.ac.kr> writes:
MGK> For the data c1 of size 14, stem provides the following result.
MGK> **************************************************************
>> c1
MGK> [1] 14 39 70 11 38 20 37 15 41 74 74 34 48 51
ZZangi> stem(c1)
MGK> The decimal point is 1 digit(s) to the right of the |
MGK> 0 | 145
MGK> 2 | 04789
MGK> 4 | 181
MGK> 6 | 044
MGK> **************************************************************
MGK> However, stem does not give a correct answer, for example 34, 74, etc.
No bug, it is just the scale to which stem decides to plot by
default. The line
4 | 181
should give a clue that this summarises 41, 48 and 51. Since the data
is so sparse only even leading numbers are used. Try:
> dat <- c(14, 39, 70, 11, 38, 20, 37, 15, 41, 74, 74, 34, 48, 51)
> stem(dat)
The decimal point is 1 digit(s) to the right of the |
0 | 145
2 | 04789
4 | 181
6 | 044
> stem(dat, scale=2)
The decimal point is 1 digit(s) to the right of the |
1 | 145
2 | 0
3 | 4789
4 | 18
5 | 1
6 |
7 | 044
Cheers,
Berwin
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Berwin A Turlach Tel.: +61 (8) 6488 3338 (secr)
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