phaser phaser - 1 year ago 40
R Question

ggplot2: unable to adjust width of error bars

I am plotting error bars on my data using output from the

summarySE()
function in the
Rmisc
package. I would like to change the width of the horizontal lines on each error bar. For some reason,
width
is not working properly.

I have looked at solutions and NONE of them worked:

Width of error bars in ggplot2

http://www.sthda.com/english/wiki/ggplot2-error-bars-quick-start-guide-r-software-and-data-visualization

ggplot2 position_dodge affects error bar width

Nothing has worked. Here is a snip it of my data:

df <- structure(list(yrmonth = structure(c(1456790400, 1456790400,
1456790400, 1459468800, 1459468800, 1459468800, 1462060800, 1462060800,
1462060800, 1464739200, 1464739200, 1464739200), class = c("POSIXct",
"POSIXt"), tzone = "UTC"), index = structure(c(1L, 4L, 5L, 1L,
4L, 5L, 1L, 4L, 5L, 1L, 4L, 5L), .Label = c("N-S", "N-S", "E-W",
"E-W", "OS"), class = "factor"), N = c(2, 1, 1, 2, 1, 1, 2, 1,
1, 2, 1, 1), GDDTomatoes = c(151, 136, 61, 221.5, 211, 151, 273,
253, 207, 376, 386, 362), sd = c(7.07106781186548, NA, NA, 3.53553390593274,
NA, NA, 0, NA, NA, 5.65685424949238, NA, NA), se = c(5, NA, NA,
2.5, NA, NA, 0, NA, NA, 4, NA, NA), ci = c(63.5310236808735,
NA, NA, 31.7655118404367, NA, NA, 0, NA, NA, 50.8248189446988,
NA, NA)), .Names = c("yrmonth", "index", "N", "value",
"sd", "se", "ci"), row.names = c(NA, 12L), class = "data.frame")


Here is one of my ggplot attempts that didn't work. When I use the
width
parameter, no matter what number I put in
width
the horizontal lines disappear altogether. I would just like to shorten them a bit.

ggplot(df, aes(x=yrmonth,y=value,colour=factor(index))) +
geom_errorbar(aes(ymin=value-se, ymax=value+se), width=0.5) +
geom_line()

Answer Source
ggplot(df, aes(x=as.factor(yrmonth),y=value)) + 
  geom_point() +
  geom_errorbar(aes(ymin=value-se, ymax=value+se), width=.5) +
  geom_line(aes(x=as.numeric(as.factor(yrmonth)))) +
  facet_wrap(~index)

enter image description here

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