mapMiss function

Map with information about missing/imputed values

Map of observed and missing/imputed values.

mapMiss(
  x,
  coords,
  map,
  delimiter = NULL,
  selection = c("any", "all"),
  col = c("skyblue", "red", "orange"),
  alpha = NULL,
  pch = c(19, 15),
  col.map = grey(0.5),
  legend = TRUE,
  interactive = TRUE,
  ...
)

Arguments

• x: a vector, matrix or data.frame.
• coords: a data.frame or matrix with two columns giving the spatial coordinates of the observations.
• map: a background map to be passed to bgmap().
• delimiter: a character-vector to distinguish between variables and imputation-indices for imputed variables (therefore, x needs to have colnames()). If given, it is used to determine the corresponding imputation-index for any imputed variable (a logical-vector indicating which values of the variable have been imputed). If such imputation-indices are found, they are used for highlighting and the colors are adjusted according to the given colors for imputed variables (see col).
• selection: the selection method for displaying missing/imputed values in the map. Possible values are "any" (display missing/imputed values in any variable) and "all" (display missing/imputed values in all variables).
• col: a vector of length three giving the colors to be used for observed, missing and imputed values. If a single color is supplied, it is used for all values.
• alpha: a numeric value between 0 and 1 giving the level of transparency of the colors, or NULL. This can be used to prevent overplotting.
• pch: a vector of length two giving the plot characters to be used for observed and missing/imputed values. If a single plot character is supplied, it will be used for both.
• col.map: the color to be used for the background map.
• legend: a logical indicating whether a legend should be plotted.
• interactive: a logical indicating whether information about selected observations can be displayed interactively (see Details ).
• ...: further graphical parameters to be passed to bgmap() and graphics::points().

Details

If interactive=TRUE, detailed information for an observation can be printed on the console by clicking on the corresponding point. Clicking in a region that does not contain any points quits the interactive session.

Examples

data(chorizonDL, package = "VIM")
data(kola.background, package = "VIM")
coo <- chorizonDL[, c("XCOO", "YCOO")]
## for missing values
x <- chorizonDL[, c("As", "Bi")]
mapMiss(x, coo, kola.background)

## for imputed values
x_imp <- kNN(chorizonDL[, c("As", "Bi")])
mapMiss(x_imp, coo, kola.background, delimiter = "_imp")

References

M. Templ, A. Alfons, P. Filzmoser (2012) Exploring incomplete data using visualization tools. Journal of Advances in Data Analysis and Classification, Online first. DOI: 10.1007/s11634-011-0102-y.

See Also

bgmap(), bubbleMiss(), colormapMiss()

Author(s)

Matthias Templ, Andreas Alfons, modifications by Bernd Prantner