Two way indicator species analysis TWINSPAN

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can each be viewed by clicking on the tab. These are described in turn below.

14.2

TWINSPAN output

This window gives output similar in form to that produced by the original Fortran

TWINSPAN program for mainframe computers and DOS PCs. Use the scroll bars

to move down and across the output. It first gives information on the clustering of

the sites (quadrates), followed by the species, then finishes with the Classification

Table. For large data sets it can be almost uninterpretable.

14.3

Site summary   TWINSPAN

This table gives a summary of the subdivisions undertaken on the sites

(quadrates). In addition to the eigenvalue obtained from the RA. It gives the

number of the sites classified into the positive, negative, borderline and

misclassified groups.

14.4

Species summary   TWINSPAN

This table gives a summary of the subdivisions undertaken on the species. In

addition to the eigenvalue obtained from the RA. It gives the number the species

classified into the positive, negative, borderline and misclassified groups.

14.5

Dendrogram species   TWINSPAN

This window displays the dendrogram of the cluster analysis of the species

produced by TWINSPAN. The species grouped together within each right hand

node are displayed to the right of the plot. The names of all species assigned to

one cluster are the same colour and to separate the clusters the colour of the

groups alternates between blue and red down the screens.

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