madlib/madlib — pull request #169 by fschopp (2012-06-08 20:47:25+00:00)
Title: Fixes in probability module

**Contains the following changes:**

Wilcoxon-Signed-Rank test: Changes semantics for precision argument, Documentation update

Jira: MADLIB-405, MADLIB-534, MADLIB-553

Probability functions:
- Hollander/Wolfe ("Nonparametric statistical methods", 2nd ed., p. 38, 1999) confirm the formula that we have been using. The warning about conflicting source has been deleted. (MADLIB-405)
- No longer treat NULL as special value for precision argument (MADLIB-534)
- Negative precision will now result in using the default precision, non-finite precision will be rejected (MADLIB-553)

SQL2C++ converter:
- Support for unary expressions (needed for negative default arguments)