hardware.triads {cluster.datasets} | R Documentation |
The table defines pairs of hardware objects that are most similar along with a dissimilar object. This is Table 10.1 in Chapter 10 of Hartigan (1975) on page 178.
data(hardware.triads)
A data frame with 20 observations on the following 4 variables.
case
a character vector
similar.1
a factor for the first object of similar pair with levels B
N
P
T
similar.2
a factor for the second object of similar pair with levels B
F
S
T
odd
a factor for the different object with levels B
F
N
P
S
T
Six pieces of hardware were considered. Every possible set of three distinct pieces of hardware was examined, and a judgment was made about which two pieces were most similar. The results were reported by listing the closest pair with parentheses surrounding them, followed by the "odd" item. The hardware objects are identified as follows
"N" is a nail
"P" is a Phillips head screw
"B" is a bolt
"T" is a tack
"F" is a finishing nail
"S" is a screw
These data are used to test the triads algorithm.
Hartigan, J. A. (1975). Clustering Algorithms, John Wiley, New York.
SPAETH2 Cluster Analysis Datasets http://people.sc.fsu.edu/~jburkardt/datasets/spaeth2/spaeth2.html
Hartigan, J. A. (1975). Clustering Algorithms, John Wiley, New York.
data(hardware.triads)