[R] geom_errorbar() issue in ggplot2

[Thierry Onkelinx]

In this case the horizontal lines of the errorbars go output the limits.
And are therefore not displayed. Use coord_cartesian(xlim = 0:1) instead of
setting the limits in scale_x_continuous().

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to say
what the experiment died of. ~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data. ~ Roger Brinner
The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey

2015-04-23 12:23 GMT+02:00 Axel Urbiz <axel.urbiz op gmail.com>:

> Thanks Thierry. So if a variable x = a, and the limits for x are [a, a+b],
> is that data point considered outside the limits?
>
> Thanks,
> Axel.
>
> On Thu, Apr 23, 2015 at 6:17 AM, Thierry Onkelinx <
> thierry.onkelinx op inbo.be> wrote:
>
>> The limits are more narrow than the data. ggplot2 treats data outside the
>> limits as NA.
>>
>> ir. Thierry Onkelinx
>> Instituut voor natuur- en bosonderzoek / Research Institute for Nature
>> and Forest
>> team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
>> Kliniekstraat 25
>> 1070 Anderlecht
>> Belgium
>>
>> To call in the statistician after the experiment is done may be no more
>> than asking him to perform a post-mortem examination: he may be able to say
>> what the experiment died of. ~ Sir Ronald Aylmer Fisher
>> The plural of anecdote is not data. ~ Roger Brinner
>> The combination of some data and an aching desire for an answer does not
>> ensure that a reasonable answer can be extracted from a given body of data.
>> ~ John Tukey
>>
>> 2015-04-23 12:06 GMT+02:00 Axel Urbiz <axel.urbiz op gmail.com>:
>>
>>> Hello,
>>>
>>> I'm getting a warning message from the reproducible example below.
>>>
>>> Why would geom_errorbar() remove 2 cases in this case? Both upper and
>>> lower
>>> limits of the error bar contain var1 and are within the axis limits.
>>>
>>>
>>> df <- data.frame(var1 = seq(0, 1, 0.1), var2 = seq(0, 1, 0.1))
>>> df$ll <- ifelse(df$var1 == 0, 0, df$var1 - 0.05)
>>> df$ul <- ifelse(df$var1 == 1, 1, df$var1 + 0.05)
>>> pp1 <- ggplot(data = df,
>>>             aes(x = var2, y = var1)) +
>>>             geom_line() + geom_point() +
>>>             scale_x_continuous(limits = c(0, 1), breaks = seq(0, 1,
>>> 0.1)) +
>>>             scale_y_continuous(limits = c(0, 1), breaks = seq(0, 1, 0.1))
>>> pp1
>>> pp2 <- pp1 + geom_errorbar(data=df,
>>>               aes(ymin=ll,ymax=ul), width=0.02)
>>> pp2
>>> Warning message:
>>> In loop_apply(n, do.ply) :
>>>   Removed 2 rows containing missing values (geom_path).
>>> >
>>>
>>> Thanks for any pointers.
>>>
>>> Best,
>>> Axel.
>>>
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>>>
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>>
>>
>

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