Changed Fraction(double) to correctly handle near-integral arguments. Changed lcm to throw ArithmeticException (instead of returning bogus value) if the result is too large to store as an integer. Added factories for TTest, ChiSquareTest and TestUtils class with static methods to create instances and execute tests. Eliminated repeated endpoint function evalutations in BrentSolver, SecantSolver. Added setSubMatrix methods to RealMatrix, BigMatrix. Added createXIdentityMatrix methods to MatrixUtils and deprecated getIdentity methods in RealMatrixImpl, BigMatrixImpl. Modified RealMatrixImpl, BigMatrixImpl constructors to throw IllegalArgumentExceptions instead of ArrayIndexOutOfBounds when dimension arguments are not positive. Made PRNG pluggable for classes in the random package. Added RandomGenerator interface extracted from java.util.random and abstract implementation, AbstractRandomGenerator providing default implementations of methods based on nextDouble(). Added a constructor taking a RandomGenerator as an argument to RandomDataImpl. Changed ValueServer to use a RandomData in its constructor. Changes to 1.0 classes should be backward compatible (including serialization). Ported numerics improvements in commons lang Fraction implementation. Added utility methods for overflow-checked integer arithmetic and improved gcd method in MathUtils. Fixed error in TTestImpl.homoscedasticTtest. Implementation was incorrectly using heteroscedastic t statistic. Also improved sensitivity of test cases. Fixed javadoc errors. One-sided t-test significance adjustment was reversed in javadoc for boolean-valued test methods. Fixed bug in PolynomialSplineFunction to allow evaluation of the function at the last knot point. Added Weibull distribution implementation. Added Cauchy distribution implementation. Added convenience methods for rounding. Added Fraction class based on commons-lang implementation. With the fraction class, FractionFormat and ProperFractionFormat classes were added to provide fraction formatting and parsing. Fixed error in ChiSquareTestImpl. Tables containing zeros were (incorrectly) causing IllegalArgumentExceptions to be thrown. Removed JDK 1.4-dependent code from CertifiedDataAbstractTest, InvalidMatrixException and MatrixIndexException. Also dropped BeanTransformer, BeanTransformerTest from the release. Fixed cumulative frequency and cumulative percentage problem reported to the commons-dev list by Jon Langlois on 9/14. Integer arguments to getCumXxx were always returning 0 due to type conversion problems. Fixed locale-dependency in ComplexFormat. Renamed univariate package to descriptive and multivariate to regression. Improved efficiency of logGamma method in o.a.c.m.special.Gamma Added subMatrix and matrix-valued row and column accessor methods to RealMatrix, BigMatrix interfaces and RealMatrixImpl, BigMatrixImpl. Implemented equals and hashCode in RealMatrixImpl and BigMatrixImpl. Fixed RealMatrixImpl, BigMatrixImpl toString methods to handle empty matrix. Added support for "population" variance and standard deviation in Variance (resp. StandardDeviation) classes. Removed data mutators from RealMatrix, BigMatrix interfaces and RealMatrixImpl, BigMatrixImpl. RealMatrix and BigMatrix instances are now immutable. Added MatrixUtils class, including static factory methods to create RealMatrix and BigMatrix instances from arrays of various types. Changed factorial methods to return 1 for argument = 0, instead of (incorrectly) throwing IllegalArgumentException. Fixed error in SimpleRegression.getSignificance. Value returned was off by a factor of 2 (did not match javadoc). Refactored distribution package so that mixed distributions and discrete distributions with non-integer values can be represented. Added Distribution base interface as well as IntegerDistribution extending DiscreteDistribution. Previously existing discrete distributions now implement IntegerDistribution. Added Poisson distribution implementation. Eliminated unecessary array copy operations in RealMatrixImpl, BigMatrixImpl add, multiply, solve and subtract operations.