Shift (impute) numeric values for graphical exploration
# S3 method for numeric
shadow_shift(x, prop_below = 0.1, jitter = 0.05,
seed_shift = 2017 - 7 - 1 - 1850, ...)
a variable of interest to shift
the degree to shift the values. default is
the amount of jitter to add. default is 0.05
a random seed to set, if you like
extra arguments to pass