DECORANA and TWINSPAN

Written by Dr Mark Hill.

DECORANA
DECORANA is a program for ordinating multivariate species data, and will perform correspondence analysis and detrended correspondence analysis (Hill & Gauch, 1980). DECORANA was originally published in 1979, and quickly found wide favour with ecologists. In 1994, it was rewritten in Fortran 77 for use with an MSDOS interface. This is the version supplied here, now updated to work with much larger datasets. The MSDOS interface runs smoothly under Windows XP.

TWINSPAN DOS version. If you have Windows, you are advised to use WINDOWS version WinTWINS

TWINSPAN is a program for classifying species and samples, producing an ordered two-way table of their occurrence. The process of classification is hierarchical; samples are successively divided into categories, and species are then divided into categories on the basis of the sample classification. TWINSPAN, like DECORANA, has been widely used by ecologists. The current version of the program was also updated in 1994 and uses an MSDOS interface. TWINSPAN is available in a WINDOWS version.

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