line_chart_.Survey: Using line_chart_ with a Survey
In itsdalmo/reporttoolDT: Work with surveys to generate reports

This is a S3 method for line_chart_ which applies the EPSI theme to the plot. See qtable_.Survey for additional information on how they differ.

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## S3 method for class 'Survey'
line_chart_(df, vars, groups = NULL, weight = NULL,
  margin = TRUE, margin_name = NULL, wrap = FALSE)

`df`	A `data.frame` or `data.table`.
`vars`	The variables to aggregate, as a character vector.
`groups`	Variables to group by during aggregation.
`weight`	Name of a variable to weight by. Only used when `margin = TRUE`.
`margin`	If `TRUE` (the default), the first group will include a "Total".
`margin_name`	Optional: Give the margin a different name from "Total".
`wrap`	Ignored.