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CL HC - CLassification - Hierarchical Clustering

(08/22/97)

PURPOSE

Performs hierarchical clustering according to one of several clustering criteria, on factors produced by CORAN.

SEE ALSO

CL CLA [CLassification - Clusters]
CL HD [CLassification - Hierarchical clustering, calculate classes]
CL HE [CLassification - Hierarchical clustering, create doc files]
CL KM [CLassification - K Means clustering]

USAGE

.OPERATION: CL HC

.ENTER DATA FILENAME TYPE (SEQ(1), IMC(2) or PIX(3)): 2
[Enter type of input file name. All three types files are produced by CORAN/PCA. Type 1 means that classification will be performed on the sequential image data; type 2, on image factor coordinates; type 3, on pixel factor coordinates.]

.IMAGE COORDINATES FILE CODE: 1
[Enter the code number of the IMC file created by CORAN.]

.FACTOR NUMBERS: 1,3,4,6
[Enter the factors to be included in the hierarchical clustering algorithm.]

.FACTOR WEIGHT: 1.5
[Enter a weight for each factor selected. If the answer zero is given at any point, all weights from the current factor onwards are set to one. This question is asked as many times as the number of factors specified, or is terminated by the answer zero.]

.CLUSTERING CRITERION (1-5): 2
[Enter the number indicating clustering criterion to be used. Possible choices are:
Option 1: single linkage
Option 2: complete linkage
Option 3: average linkage
Option 4: centroid method
Option 5: Ward's method ]

.DO YOU WANT DENDROGRAM PLOT FILE? (Y/T/N): T
[Y - the whole dendrogram will be produced
T - truncated dendrogram will be produced (useful for large number of objects
N - no dendrogram ]

If answer is Y or T then:

.DENDROGRAM FILE: MAP001
[Enter name of file where the dendrogram will be stored.]

If truncated dendrogram was requested:

.ENTER PLOT CUTOFF: 12.3
[Enter the cutoff number at which the dendrogram will be cut. Only top portion will be produced. This number must be taken from the RESULTS file from the previous run and must be in the range of the scaling of the dendrogram tree. This range is written in the line under the tree in the RESULTS file.]

.DO YOU WANT DENDROGRAM DOC FILE? (Y/N): Y
[ Y - the document file will be produced containing information about classification tree. Using this information, one can retrieve the clustering behavior for any number of groups.]

If previous answer was Y, then:

.DOCUMENT FILE: MAP001
[Enter the document file name where the dendrogram information will be stored.]

NOTES

  1. To get the classification on a given "cutting" level use command 'CL HD'.

  2. To get the selection doc files corresponding to the given "cutting" use command 'CL HE'.

  3. To calculate averages for the classes use command 'AS DC' and selection doc. files.

  4. Implemented by P. Penczek.

SUBROUTINES

HCLS, HCLP, DIST_P

CALLER

UTIL1

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