Authors' official companion web site
At its core, NTSYS pc is designed to perform numerical taxonomy—a classification system based on quantifiable similarities rather than subjective observation. The name itself stands for "Numerical Taxonomy and Multivariate Analysis System." The software was primarily developed by F. James Rohlf to accompany methodologies often discussed in his seminal textbook, Biometry . The 2.02 version, while older, is historically significant as it established a stable, Windows-compatible interface that replaced older DOS-based command-line inputs, making complex statistics more accessible to biologists who were not necessarily expert programmers.
Unweighted Pair-Group Method using Arithmetic Averages (the most widely used for phenetic trees).
The typical workflow in NTSYSpc follows a logical pipeline: . 1. Analyzing Molecular Marker Data (Binary Data)
The distance matrix is then used to construct dendrograms through the UPGMA method to visualize relationships [5.1]. ntsys pc 2.02 software
Troubleshooting (quick)
Version is a mature release from the late 1990s (part of the 2.x series), representing a stable and feature-rich iteration before the software was later succeeded by newer platforms. It was distributed by Exeter Software and ran under Microsoft Windows 3.1/95/98 and later on Windows XP via compatibility modes.
The system relies on a modular system of subprograms. Instead of running a single monolithic command, users pass data sequentially through different modules: At its core, NTSYS pc is designed to
The software came on a set of 3.5" or 5.25" floppy disks, with a printed manual exceeding 300 pages. Installation involved configuring EMS/XMS memory and setting graphics drivers manually.
: It often works in tandem with Microsoft Excel for initial data entry (such as binary "0" and "1" scoring for presence/absence of DNA bands) and for file conversion into the proprietary Significance in Modern Science
Developed by F. James Rohlf, NTSYSpc is a system of programs used to find and display patterns in multivariate data. The "pc" indicates it was designed for the Windows environment, and version is often favored for its stability and comprehensive feature set. and highly customizable dendrograms and plots.
Row or column labels exceed the maximum character limits set by the module.
It produces distinct, high-quality, and highly customizable dendrograms and plots.
The acronym stands for Numerical Taxonomy SYStem . The software was originally built to automate the statistical methods used in numerical taxonomy—the classification of organisms based on quantifiable similarities or differences.
Ideal for morphological traits where joint absences are meaningful.
Understanding NTSYSpc 2.02: The Gold Standard for Numerical Taxonomy and Multivariate Analysis