This fits a quantile regression to the data and draws the fitted quantiles
with lines. This is as a continuous analogue to geom_boxplot
.
geom_quantile(mapping = NULL, data = NULL, stat = "quantile", position = "identity", ..., lineend = "butt", linejoin = "round", linemitre = 1, na.rm = FALSE, show.legend = NA, inherit.aes = TRUE) stat_quantile(mapping = NULL, data = NULL, geom = "quantile", position = "identity", ..., quantiles = c(0.25, 0.5, 0.75), formula = NULL, method = "rq", method.args = list(), na.rm = FALSE, show.legend = NA, inherit.aes = TRUE)
mapping  Set of aesthetic mappings created by 

data  The data to be displayed in this layer. There are three options: If A A 
position  Position adjustment, either as a string, or the result of a call to a position adjustment function. 
...  other arguments passed on to 
lineend  Line end style (round, butt, square) 
linejoin  Line join style (round, mitre, bevel) 
linemitre  Line mitre limit (number greater than 1) 
na.rm  If 
show.legend  logical. Should this layer be included in the legends?

inherit.aes  If 
geom, stat  Use to override the default connection between

quantiles  conditional quantiles of y to calculate and display 
formula  formula relating y variables to x variables 
method  Quantile regression method to use. Currently only supports

method.args  List of additional arguments passed on to the modelling
function defined by 
geom_quantile
understands the following aesthetics (required aesthetics are in bold):
x
y
alpha
colour
group
linetype
size
weight
quantile of distribution
#>#> #>#>#> #>#> #>#>#> #>#>#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'm + geom_quantile(quantiles = 0.5)#>#> Warning: partial match of 'coef' to 'coefficients'q10 < seq(0.05, 0.95, by = 0.05) m + geom_quantile(quantiles = q10)#>#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'# You can also use rqss to fit smooth quantiles m + geom_quantile(method = "rqss")#>#> Warning: partial match of 'factor' to 'factors'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'factor' to 'factors'#> Warning: partial match of 'factor' to 'factors'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'factor' to 'factors'#> Warning: partial match of 'factor' to 'factors'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'factor' to 'factors'# Note that rqss doesn't pick a smoothing constant automatically, so # you'll need to tweak lambda yourself m + geom_quantile(method = "rqss", lambda = 0.1)#>#> Warning: partial match of 'factor' to 'factors'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'factor' to 'factors'#> Warning: partial match of 'factor' to 'factors'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'factor' to 'factors'#> Warning: partial match of 'factor' to 'factors'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'factor' to 'factors'# Set aesthetics to fixed value m + geom_quantile(colour = "red", size = 2, alpha = 0.5)#>#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'#> Warning: partial match of 'coef' to 'coefficients'