Prepares a Trend Graph

Reads a data frame and line plots all variables (which need to be numeric) by an ordered factor (normally the time-series indicator).

prepare_trend_graph(
  df,
  ts_id,
  var = colnames(df[sapply(df, is.numeric) & colnames(df) != ts_id])
)

Arguments

df	Data frame containing the ordered factor and a set of numerical variables to be plotted
ts_id	a string containing the column name of the ordered factor (normally the time-series indicator)
var	a character vector containing the column names of the variables that should be plotted. Defaults to all numeric variables of the data frame besides the one indicated by ts_id.

Value

A list containing two items:

"df"

A data frame containing the plotted means and standard errors

"plot

The plot as returned by ggplot

Examples

df <- data.frame(year = floor(time(EuStockMarkets)), EuStockMarkets)
graph <- prepare_trend_graph(df, "year")
graph$plot