Smallset_Timeline {smallsets}

Smallset Timeline

Description

Builds a Smallset Timeline to visualise data preprocessing decisions.

Usage

Smallset_Timeline(
  data,
  code,
  rowCount = 5,
  rowSelect = NULL,
  rowReturn = FALSE,
  rowIDs = NULL,
  ignoreCols = NULL,
  colours = 1,
  printedData = FALSE,
  truncateData = NULL,
  ghostData = TRUE,
  missingDataTints = FALSE,
  align = "horizontal",
  font = "sans",
  sizing = sets_sizing(),
  spacing = sets_spacing(),
  labelling = sets_labelling(),
  altText = FALSE
)

Arguments

data

Dataset that is being preprocessed.

code

R, R Markdown, Python, or Jupyter Notebook data preprocessing script. Include the filename extension (e.g., "my_code.R", "my_code.Rmd", "my_code.py", or "my_code.ipynb"). If the script is not in the working directory, include the full file path.

rowCount

Integer between 5-15 for number of Smallset rows.

rowSelect

NULL, 1, or 2. If NULL, Smallset rows are randomly sampled. If 1, Smallset rows are selected using the coverage optimisation model. If 2, Smallset rows are selected using the coverage + variety optimisation model, which has a long run time for large datasets. Options 1 and 2 use the Gurobi solver (v9.1.2) and require a Gurobi license. Please visit https://www.gurobi.com to obtain a license (free academic licenses are available).

rowReturn

A logical. TRUE prints, to the console, the row numbers of the rows selected for the Smallset.

rowIDs

If R preprocessing code, a character vector of row names for rows to include in the Smallset. If Python preprocessing code, a numeric vector of indices for rows to include in the Smallset.

ignoreCols

Character vector of column names indicating which to exclude from the Smallset Timeline.

colours

Either 1, 2, or 3 for one of the built-in colour schemes (all are colourblind-friendly and 2 works on a grey scale, i.e., it's printer-friendly) or a list with four hex colour codes for added, deleted, edited, and unchanged (e.g., list(added = "#5BA2A6", deleted = "#DDC492", edited = "#FFC500", unchanged = "#E6E3DF")).

printedData

A logical. TRUE prints data values in the Smallset snapshots.

truncateData

Integer for the number of characters in each printed data value. Results in characters plus an ellipsis.

ghostData

A logical. TRUE includes empty tiles where data have been removed.

missingDataTints

A logical. TRUE plots a lighter colour value for a missing data value.

align

Either "horizontal" or "vertical". For horizontal, snapshots are plotted left to right. For vertical, snapshots are plotted top to bottom.

font

Any font installed in R.

sizing

sets_sizing for size specifications.

spacing

sets_spacing for space specifications.

labelling

sets_labelling for label specifications.

altText

A logical. TRUE generates alternative text (alt text) for the Smallset Timeline and prints it to the console.

Details

Prior to running this command, structured comments with snapshot instructions must be added to the preprocessing script passed to code. See section titled "Structured comments" in vignette("smallsets") or in the online user guide.

Value

Returns a Smallset Timeline object, which is a plot consisting of 'ggplot' objects assembled with 'patchwork'.

Examples

set.seed(145)

Smallset_Timeline(
  data = s_data,
  code = system.file("s_data_preprocess.R", package = "smallsets")
)