`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)

## Arguments

data |
Either a `panel_data` frame or another data frame. |

var |
The unquoted name of the variable of interest. |

id |
If `data` is not a `panel_data` object, then the id variable. |

wave |
If `data` is not a `panel_data` object, then the wave variable. |

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` ) are plotted. You may also supply a vector of ids to
choose them yourself. |

n.random.subset |
How many entities to randomly sample when `subset.ids`
is TRUE. |

add.mean |
Add a line representing the mean trend? Default is FALSE.
Cannot be combined with `overlay` . |

mean.function |
The mean function to supply to `geom_smooth` when
`add.mean` is TRUE. Default is `"lm"` , but another option of interest is
`"loess"` . |

line.size |
The thickness of the plotted lines. Default: 0.5 |

alpha |
The transparency for the lines and points. When
`overlay = TRUE` , it is set to 0.5, otherwise 1, which means
non-transparent. |

## Value

The `ggplot`

object.

## Examples