Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
English dictionary Main references
Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).
Biplots are a type of graph used in statistics. A biplot allows information on both samples and variables of a data matrix to be displayed graphically. Samples are displayed as points while variables are displayed either as vectors, linear axes or nonlinear trajectories. In the case of categorical variables, category level points may be used to represent the levels of a categorical variable. A generalised biplot displays information on both continuous and categorical variables.
The biplot was introduced by Gabriel (1971). Gower and Hand (1996) wrote a monograph. Yan and Kang (2003) describe various methods to visualize and interpret a biplot.
Gabriel, K.R. (1971). [Expression error: Missing operand for > "The biplot graphic display of matrices with application to principal component analysis"]. Biometrika58 (3): 453–467.
Yan, W., Kang, M.S. 2003. GGE Biplot Analysis. CRC Press, Boca Raton, FL. ISBN 0849313384
Vicente-Villardón, J.L.; Galindo M.P., Blázquez-Zaballos, A. (2006). Logistic Biplots. In: Multiple correspondence analysis and related methods. Greenacre M.; Blasius, J. (Eds) Chapman & Hall/CRC Press. Boca de Raton. USA. 608 p. ISBN 1584886285
Demey JR, JL Vicente-Villardón, MP Galindo-Villardón, AY Zambrano. 2008. Identifying molecular markers associated with classification of genotypes by External Logistic Biplots. Bioinformatics. 24(24):2832-2838
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