Increase space between x-axis factors in ggplot - r

Question

I am using the geom_pointrange function in ggplot2 in order to plot the spread of some measurement over different condition for 5 subjects. In order not to have the subjects overlap I have constructed the plot as follows:
Final = structure(list(Subject = structure(c(1L, 1L, 1L, 1L, 1L, 1L,
1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L,
3L, 3L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 5L, 5L, 5L, 5L, 5L, 5L,
5L, 5L), .Label = c("1", "2", "3", "4", "5"), class = "factor"),
X00.conditionName = structure(c(1L, 1L, 2L, 2L, 3L, 3L, 4L,
4L, 1L, 1L, 2L, 2L, 3L, 3L, 4L, 4L, 1L, 1L, 2L, 2L, 3L, 3L,
4L, 4L, 1L, 1L, 2L, 2L, 3L, 3L, 4L, 4L, 1L, 1L, 2L, 2L, 3L,
3L, 4L, 4L), .Label = c("EyeClose-Haptic", "mixed-Haptic_Visual",
"only-Haptic", "only-Visual"), class = "factor"), X03.totalTargetNumber = c(2L,
3L, 2L, 3L, 2L, 3L, 2L, 3L, 2L, 3L, 2L, 3L, 2L, 3L, 2L, 3L,
2L, 3L, 2L, 3L, 2L, 3L, 2L, 3L, 2L, 3L, 2L, 3L, 2L, 3L, 2L,
3L, 2L, 3L, 2L, 3L, 2L, 3L, 2L, 3L), Accuracy = c(0.075870763,
0.0907863686, 0.0222156611, 0.0492028585333333, 0.0301178471,
0.0736098328666667, 0.0329723832, 0.0455095300666667, 0.065151615,
0.0979033533333333, 0.0247176775, 0.0335825226666667, 0.027385248,
0.0462643053333333, 0.037272505, 0.0652166726666667, 0.043005086,
0.061848328, 0.031106749, 0.0275656054, 0.026701889, 0.0373967466666667,
0.028998468, 0.03219287, 0.0597213356, 0.0851717708333333,
0.030286913, 0.0779058462666667, 0.043368508, 0.051437624,
0.029002474, 0.0479204566666667, 0.094555739, 0.0856268291666667,
0.031908514, 0.0310441326666667, 0.036311762, 0.0496942306666667,
0.054625148, 0.0482682121666667), upperCI = c(0.116082073022708,
0.139632763787946, 0.0315087794760623, 0.0727058964327625,
0.0468512606854127, 0.116787586356955, 0.0444933233012107,
0.062820743812494, 0.0858551911272202, 0.136013260005381,
0.0327074347874691, 0.0460471773903695, 0.035302995136302,
0.0740077338495226, 0.0641795522210299, 0.131047110446756,
0.0572545979325947, 0.0809511078363974, 0.0414215170576924,
0.0341480438532189, 0.0382253716300962, 0.0519626825555577,
0.0377955915789704, 0.0430125127419472, 0.0903928001427357,
0.114245467448517, 0.0461054194398361, 0.129350863514659,
0.0635159480110737, 0.0717647837071829, 0.0371919026867606,
0.0615899295823839, 0.170222051412597, 0.128502458351433,
0.046712862081242, 0.0388340720489338, 0.0574188259607336,
0.0786845830951613, 0.0844193698576058, 0.0784830058409822
), lowerCI = c(0.0356594529772922, 0.0419399734120541, 0.0129225427239377,
0.0256998206339042, 0.0133844335145873, 0.0304320793763786,
0.0214514430987893, 0.0281983163208393, 0.0444480388727798,
0.059793446661286, 0.0167279202125309, 0.0211178679429639,
0.019467500863698, 0.0185208768171441, 0.0103654577789701,
-0.000613765113422152, 0.0287555740674053, 0.0427455481636026,
0.0207919809423076, 0.0209831669467811, 0.0151784063699038,
0.0228308107777757, 0.0202013444210296, 0.0213732272580528,
0.0290498710572643, 0.0560980742181497, 0.0144684065601638,
0.0264608290186746, 0.0232210679889263, 0.0311104642928171,
0.0208130453132394, 0.0342509837509495, 0.018889426587403,
0.0427511999819006, 0.017104165918758, 0.0232541932843995,
0.0152046980392664, 0.0207038782381721, 0.0248309261423941,
0.0180534184923511), CondLevel = c("EyeClose-Haptic2", "EyeClose-Haptic3",
"mixed-Haptic_Visual2", "mixed-Haptic_Visual3", "only-Haptic2",
"only-Haptic3", "only-Visual2", "only-Visual3", "EyeClose-Haptic2",
"EyeClose-Haptic3", "mixed-Haptic_Visual2", "mixed-Haptic_Visual3",
"only-Haptic2", "only-Haptic3", "only-Visual2", "only-Visual3",
"EyeClose-Haptic2", "EyeClose-Haptic3", "mixed-Haptic_Visual2",
"mixed-Haptic_Visual3", "only-Haptic2", "only-Haptic3", "only-Visual2",
"only-Visual3", "EyeClose-Haptic2", "EyeClose-Haptic3", "mixed-Haptic_Visual2",
"mixed-Haptic_Visual3", "only-Haptic2", "only-Haptic3", "only-Visual2",
"only-Visual3", "EyeClose-Haptic2", "EyeClose-Haptic3", "mixed-Haptic_Visual2",
"mixed-Haptic_Visual3", "only-Haptic2", "only-Haptic3", "only-Visual2",
"only-Visual3")), .Names = c("Subject", "X00.conditionName",
"X03.totalTargetNumber", "Accuracy", "upperCI", "lowerCI", "CondLevel"
), row.names = c(NA, -40L), class = "data.frame")
require(ggplot2)
pdf("Pilot2.pdf", w = 12, h = 8)
limits <- aes(ymax = upperCI, ymin=lowerCI)
BaseLayer = ggplot(data = Final, aes (x = X00.conditionName, y = Accuracy, color = Subject, group = Subject ))
BaseLayer + geom_pointrange(limits, position=position_dodge(width=1), size = 1.5) +
theme(axis.text=element_text(size=14), axis.title=element_text(size=14), axis.text.x = element_text(angle = 25, hjust = 1)) +
facet_grid (.~X03.totalTargetNumber) + ggtitle ("Pilot 2") + xlab ("Condition")
dev.off()
As you can see the x-axis is discrete, and the points are very "crowded", so that it is difficult to tell apart the different categories.
Is there a way to increase the space between the different categories ?

Answer 1

The best solutoin is to use facets to create 8 separate tall and skinny plots with all these features that are separated by a thin white gutter between them with a solid label at the top. You could keep or lose X-axis labels. It creates one figure of 8 graphs that communicates better than on big graph.
Like this:Stack-ggplot2-geom-pointrange-facet-grid-with-coord-flip
except yours would be verticle