morsecodes

0th

Percentile

Rothkopf Morse Code Data

A standard data set for Multidimensional Scaling (MDS) obtained by Rothkopf based on the confusion rates observed by exposing subjects to pairs of morse codes.

Keywords
datasets
Usage
data(morsecodes)
Details

The raw data from the XGvis directory may be read as mc.raw <- as.matrix(read.table("....xgobi/data_xgvis/morsecodes.raw")) dimnames(mc.raw) <- NULL; storage.mode(mc.raw) <- "integer" morsecodes.raw <- mc.raw.

The *.dist matrix is produced from the raw data by mc.sim <- (mc.raw + t(mc.raw))/2 ; ds <- diag(mc.sim) morsecodes.dist <- rep(ds,36) + rep(ds,rep(36,36)) - 2*mc.sim, i.e., $d[i,j] := s[i,i] + s[j,j] - 2 * s[i,j]$.

Format

9 data sets used for analyzing the data in XGvis and XGobi.

morsecodes.raw
36 x 36 raw data of confusion rates
morsecodes.dist
36 x 36 dissimilarity matrix
morsecodes.pos
36 x 10 initial configuration
morsecodes.colors
36 point colors
morsecodes.glyphs
36 point glyphs
morsecodes.lines
33 lines
morsecodes.linecolors
33 line colors
morsecodes.row
36 x 2 matrix of (letter, morsecode)

Source

Contained in the ‘data\_xgvis’ subdirectory of the XGobi and XGvis source bundle, available via http://www.research.att.com/areas/stat/xgobi/index.html#download.

References

A. Buja, D. F. Swayne, M. Littman, & N. Dean (1998). XGvis: Interactive Data Visualization with Multidimensional Scaling. http://www.research.att.com/areas/stat/xgobi/xgvis98.ps.gz.

Aliases
  • morsecodes
  • morsecodes.col
  • morsecodes.colors
  • morsecodes.dist
  • morsecodes.glyphs
  • morsecodes.linecolors
  • morsecodes.lines
  • morsecodes.pos
  • morsecodes.raw
  • morsecodes.row
Examples
data(morsecodes)
ls.str(pat="^morsecode")
morsecodes.row # remember what you learned in...
## real row names
(mc.row <- paste(morsecodes.row[,1], morsecodes.row[,2]))[1:8]

image(1:36, 1:36, morsecodes.raw, main="`morsecodes' raw confusion rates")
text(1:36,1:36, morsecodes.row[,1])

##--> help(xgvis) for running multidimensional scaling (MDS) and XGobi on these
Documentation reproduced from package xgobi, version 1.2-15, License: file LICENSE

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