line_plot  R Documentation 
line_plot
allows for flexible visualization of repeated
measures variables from panel_data
frames.
line_plot(
data,
var,
id = NULL,
wave = NULL,
overlay = TRUE,
show.points = TRUE,
subset.ids = FALSE,
n.random.subset = 9,
add.mean = FALSE,
mean.function = "lm",
line.size = 1,
alpha = if (overlay) 0.5 else 1
)
data 
Either a 
var 
The unquoted name of the variable of interest. 
id 
If 
wave 
If 
overlay 
Should the lines be plotted in the same panel or each in their own facet/panel? Default is TRUE, meaning they are plotted in the same panel. 
show.points 
Plot a point at each wave? Default is TRUE. 
subset.ids 
Plot only a subset of the entities' lines? Default is NULL,
meaning plot all ids. If TRUE, a random subset (the number defined by

n.random.subset 
How many entities to randomly sample when 
add.mean 
Add a line representing the mean trend? Default is FALSE.
Cannot be combined with 
mean.function 
The mean function to supply to 
line.size 
The thickness of the plotted lines. Default: 0.5 
alpha 
The transparency for the lines and points. When

The ggplot
object.
data("WageData")
wages < panel_data(WageData, id = id, wave = t)
line_plot(wages, lwage, add.mean = TRUE, subset.ids = TRUE, overlay = FALSE)
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