Passion is like genius; a miracle.

This is slightly modified version of example in tree package reference manual. Partition plot can draw a diagram representing leaves of a tree. Then we get a plot like: Reference) http://cran.r-project.org/web/packages/tree/tree.pdf

https://stat.ethz.ch/pipermail/r-help/2005-May/070922.html https://stat.ethz.ch/pipermail/r-help/2001-July/014175.html Use rpart instead of tree for decision tree in R.

http://www.statmethods.net/advstats/cart.html Classification/Regression tree, conditional inference tree, and random forest.

http://strataconf.com/strata2012/public/schedule/proceedings Thank you Oreilly and Strata.

Google has an interesting automatic prediction API: https://developers.google.com/prediction/ It has an easy to follow hello world which predicts the language(ENGLISH/SPANISH/FRENCH) of the given sentence: https://developers.google.com/prediction/docs/hello_world In the hello world example, one thing that was confusing was ‘Switching to private mode’. For that, you just need to turn on OAuth 2.0 on the top right of…

One sample runs test examines if observations are random. Here, run menas the number of consecutive observations of one class from two categories. For example, MMMFFF: Observed three males then, three females. # of run = 2. MFMF: Observed, man, wonman, man, then woman. # of run = 4. This idea can be used for,…

Kruskal Wallis test is non parametric version of one way variance of anova. It’s also the extension of Wilcox’s rank sum test for more than 2 populations. Basic idea is very similar to rank sum test. We just sort all observation, and see if mean rank sum is different depending on classes. In the example…

This post discusses non parametric testing methods: sign test, signed rank test and rank sum test. Sign Test Sign test tests if the median of data is md. For example, given: If , then the number of positive signs of x – 5 should be about 4 (= the number of data / 2 =…