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StatAssist :: Product Features

StatAssist allows to easily select a probability distribution, specify parameter values, and view the distribution graphs and related properties depending on the parameters specified. Features include:

• support for over 40 continuous & discrete distributions
• high-quality interactive graphs with export and print options
• statistical moments, quantiles, and probability calculations
• integrated random number generator
• visual distribution gallery
• easy to use interface

Graphs

StatAssist displays a number of interactive graphs which can be zoomed, panned, exported, and printed:

• probability density function (PDF)
• cumulative distribution function (CDF)
• survival function
• hazard function (failure rate)
• cumulative hazard function

Calculations

StatAssist provides the following information depending on the selected distribution and its parameters:

• domain type, minimum, maximum, mode
• mean, variance, standard deviation, coef. of variation
• skewness, kurtosis
• values of PDF(x), CDF(x), Survival(x) etc.

For continuous distributions, you can also estimate the inverse CDF (also known as the quantile function, or the percent point function), x(F).

Probabilities

StatAssist allows to specify one or two x values (delimiters) which divide the entire X axis into several intervals. For each of the intervals, it calculates and displays the probability that the variate takes on a value from that interval, depending on the distribution type. The delimiters you specify are also displayed on the PDF graph for better perception of the results.

Supported Distributions

StatAssist supports all the commonly used continuous distributions:

Beta Cauchy Chi-Squared Erlang Error Function Exponential F Distribution Fatigue Life Frechet Gamma

Gumbel Max Gumbel Min Inverse Gaussian Johnson SB Johnson SU Laplace Logistic Log-Logistic Lognormal Normal

Pareto Pert Power Function Rayleigh Student's t Triangular Uniform Weibull

Many distributions are available in two versions. For example, both two-parameter and three-parameter Weibull distributions are supported. In addition, six advanced distributions are available:

Generalized Extreme Value Generalized Logistic Generalized Pareto

Phased Bi-Exponential Phased Bi-Weibull Wakeby

The following discrete distributions are supported:

Bernoulli Binomial Discrete Uniform Geometric

Hypergeometric Logarithmic Negative Binomial Poisson

Random Numbers

With StatAssist, you can easily generate random numbers from any of the supported distributions, save them as a text file, or, at your convenience, copy them to the Clipboard.