HyperStat Online

Introductory hypertext statistics book. Each chapter contains links to related materials including educational demos and web-based statistical analysis programs.

http://davidmlane.com/hyperstat/

A New View of Statistics

An on-line text book of statistics for researchers in biomedical and other empirical sciences.

http://www.sportsci.org/resource/stats/

Briefbook of Data Analysis

A condensed handbook in encyclopedic format, covering subjects in statistics, computing, analysis and related fields. In HTML: a printed version is available.

http://physics.web.cern.ch/Physics/DataAnalysis/BriefBook/

Concepts and Applications of Inferential Statistics

A full-length and occasionally interactive statistics textbook on the web.

http://faculty.vassar.edu/~lowry/webtext.html

InterStat

Open source of articles about statistics. Indexed by date, author, title and keyword. Uses PDF and PS coding.

http://interstat.statjournals.net/

Medical Statistics at a Glance

Companion site for the book by Aviva Petrie and Caroline Sabin (Blackwell). MCQs, self-tests, further resources.

http://www.medstatsaag.com/

Reversibility and Stochastic Networks

By Frank Kelly, University of Cambridge. Full text of this book now available for download in PDF and DjVu formats.

http://www.statslab.cam.ac.uk/~frank/rsn.html

Sequential Simplex Optimization

Electronic reprint of the classical textbook on improving quality and productivity in research, development, and manufacturing.

http://www.grabitech.com/

StatSoft: Electronic Statistical Textbook

Offers training in the understanding and application of statistics.

http://www.statsoft.com/Textbook

Statistical and Inductive Inference by Minimum Message Length

Book by Prof. C. S. Wallace, on the minimum message length criterion for model selection in statistics and machine learning.

http://www.springer.com/statistics/statistical%2Btheory%2Band%2Bmethods/book/978-0-387-23795-4