[R] Simple Question: adding points to a boxplot

[David Winsemius]

On Aug 7, 2009, at 6:43 PM, Farley, Robert wrote:

> I apologize in advance for the simplicity of this question.  I use R  
> 2-3 times a year, and I seem to forget more in the intervening  
> months than I learn during my days of panicked reading....  I HAVE  
> tried looking at the help resources; I'm just not very good at  
> understanding them.
>
> I have a dataframe with 18 observations of 5 different things, and a  
> second dataframe with and estimate for those 5 things.  I'm trying  
> to add the estimated points to the boxplot of observations.  I THINK  
> I'm failing because I need to decompose my estimated dataframe into  
> two vectors.  I can't seem to figure out how to do that properly, or  
> if I'm suffering from a different misunderstanding....
>
Obs1 <-read.table(textConnection(" Blue Green    Red  Gold Orange
1  77902 32911 117543 18245     NA
2  77294 32204 114927 18377     NA
3  75737 31484 115265 18529     NA
4  73366 31130 112371 14748     NA
5  77061 33601 118113 16910  16360
6  75177 32383 113825 14417  15492
7  76766 35697 124304 16318  16100
8  80378 36374 128091 15325  17636
9  84078 37473 138219 15769  18242
10 81704 37247 136345 15587  18700
11 84554 39134 143830 18078  21828
12 80411 37487 137583 18771  20844
13 76103 34734 131469 20329  20760
14 76246 34591 127921 18874  19531
15 72025 33645 118279 20972  21005
16 72295 35153 121752 18035  20217
17 71287 32961 121958 17768  20659
18 71778 32833 123990 17956  19004"), header=TRUE)
Est1<-read.table(textConnection("  Blue Green    Red  Gold Orange
1 72289 32444 107121 20900  21962"), header=TRUE)
boxplot(Obs1)
points(1:5, Est1, pch=23, col="red")

>>
>> points(Est1, pch=23, col="red")

I think you are only supplying y values with no x  values:
Try:

points(1:5, Est1, pch=23, col="red")


>>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT