morsecodes: Rothkopf Morse Code Data

In xgobi: Interface to the XGobi and XGvis programs for graphical data analysis

Description

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.

Usage

data(morsecodes)

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)
morsecodes.col	10 column names of the initial configuration

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].

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.

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

Example output

morsecodes.col :  chr [1:12] "LEN" "DASH" "POS 1" "POS 2" "POS 3" "POS 4" "POS 5" "SEQ" ...
morsecodes.colors :  chr [1:36] "SkyBlue" "Green" "Green" "Yellow" "HotPink" "Green" "Yellow" ...
morsecodes.dist :  int [1:36, 1:36] 0 167 169 159 180 164 163 163 75 165 ...
morsecodes.glyphs :  num [1:36] 27 27 27 27 27 27 27 27 27 27 ...
morsecodes.linecolors :  chr [1:33] "SkyBlue" "SkyBlue" "Green" "Green" "Green" "Green" "Yellow" ...
morsecodes.lines :  num [1:33, 1:2] 1 1 2 2 3 3 4 4 5 6 ...
morsecodes.pos :  num [1:36, 1:12] 0.25 0.75 0.75 0.5 0 0.75 0.5 0.75 0.25 0.75 ...
morsecodes.raw :  int [1:36, 1:36] 92 5 4 8 6 4 9 3 64 7 ...
morsecodes.row :  chr [1:36, 1:2] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" ...
      [,1] [,2]   
 [1,] "A"  ".-"   
 [2,] "B"  "-..." 
 [3,] "C"  "-.-." 
 [4,] "D"  "-.."  
 [5,] "E"  "."    
 [6,] "F"  "..-." 
 [7,] "G"  "--."  
 [8,] "H"  "...." 
 [9,] "I"  ".."   
[10,] "J"  ".---" 
[11,] "K"  "-.-"  
[12,] "L"  ".-.." 
[13,] "M"  "--"   
[14,] "N"  "-."   
[15,] "O"  "---"  
[16,] "P"  ".--." 
[17,] "Q"  "--.-" 
[18,] "R"  ".-."  
[19,] "S"  "..."  
[20,] "T"  "-"    
[21,] "U"  "..-"  
[22,] "V"  "...-" 
[23,] "W"  ".--"  
[24,] "X"  "-..-" 
[25,] "Y"  "-.--" 
[26,] "Z"  "--.." 
[27,] "1"  ".----"
[28,] "2"  "..---"
[29,] "3"  "...--"
[30,] "4"  "....-"
[31,] "5"  "....."
[32,] "6"  "-...."
[33,] "7"  "--..."
[34,] "8"  "---.."
[35,] "9"  "----."
[36,] "0"  "-----"
[1] "A .-"   "B -..." "C -.-." "D -.."  "E ."    "F ..-." "G --."  "H ...."

xgobi documentation built on May 1, 2019, 10:06 p.m.