Stixbox

            Purpose
-------

Stixbox is a statistics toolbox which provides distribution functions, datasets,
statistical tests and plotting facilities. 

Features
--------

 * Datasets
   * getdata : Famous datasets 
 * Graphics
   * Tutorial : Demos of the graphics.
   * boxplot : Draw a box plot
   * bubblechart : Plot a bubble chart
   * bubblematrix : Plot a bubble chart
   * filledbounds : Fill the area between two curves
   * histo : Plot a histogram
   * identify : Identify points on a plot with mouse clicks
   * plotmatrix : Plot an X vx Y scatter plot matrix
   * plotsym : Plot with symbols
   * qqnorm : Normal probability paper
   * qqplot : Create a QQ-plot
   * stairs : Stairstep graph
 * Logistic Regression
   * lodds : Log odds function 
   * loddsinv : inverse of log odd 
   * logitfit : Fit a logistic regression model 
 * Miscellaneous
   * betaln : Logarithm of beta function 
   * cov : Covariance matrix 
   * histocvimse : Cross-validation IMSE of an histogram.
   * histocvsearch : Search optimal CV number of bins in a histogram.
   * ksdensity : Kernel smoothing density estimate
   * ksdensity_kernelcdf : Evaluate kernel for CDF
   * ksdensity_kernelpdf : Evaluate kernel for PDF
   * quantile : Empirical quantile (percentile). 
   * regres : Multiple linear regression
   * regresprint : Print linear regression
   * stixbox_getpath : Returns the path to the current module.
 * Random Numbers
   * rexpweib : Random numbers from the exponential or weibull distributions 
 * Regression
   * cmpmod : Compare linear submodel versus larger one
   * lsfit : Fit a multiple regression normal model
   * lsselect : Select a predictor subset for regression
   * regres : Multiple linear regression
   * regresprint : Print linear regression
 * Resampling
   * T and extra arguments : How to use extra-arguments in T.
   * ciboot : Bootstrap confidence intervals
   * covboot : Bootstrap estimate of the variance of a parameter estimate.
   * covjack : Jackknife estimate of the variance of a parameter estimate.
   * rboot : Simulate a bootstrap resample
   * stdboot : Bootstrap estimate of the parameter standard deviation.
   * stdjack : Jackknife estimate of the standard deviation of a parameter
estimate.
 * Tests, confidence intervals and model estimation
   * ciquant : Nonparametric confidence interval for quantile
   * kstwo : Kolmogorov-Smirnov statistic from two samples
   * test1b : Bootstrap test that mean equals zero
   * test1n : Test that mean equals zero (Normal)
   * test1r : Test for median equals 0 using rank test
   * test2n : Tests two normal samples with equal variance
   * test2r : Test location equality of two samples using rank test