StatXact
Encyclopedia
StatXact is a statistical software package for exact statistics
. It calculates exact p-value
s and confidence interval
s for contingency table
s and non-parametric procedures
. It is marketed by Cytel
Inc.
Exact statistics
Exact statistics, such as that described in exact test, is a branch of statistics that was developed to provide more accurate results pertaining to statistical testing and interval estimation by eliminating procedures based on asymptotic and approximate statistical methods...
. It calculates exact p-value
P-value
In statistical significance testing, the p-value is the probability of obtaining a test statistic at least as extreme as the one that was actually observed, assuming that the null hypothesis is true. One often "rejects the null hypothesis" when the p-value is less than the significance level α ,...
s and confidence interval
Confidence interval
In statistics, a confidence interval is a particular kind of interval estimate of a population parameter and is used to indicate the reliability of an estimate. It is an observed interval , in principle different from sample to sample, that frequently includes the parameter of interest, if the...
s for contingency table
Contingency table
In statistics, a contingency table is a type of table in a matrix format that displays the frequency distribution of the variables...
s and non-parametric procedures
Non-parametric statistics
In statistics, the term non-parametric statistics has at least two different meanings:The first meaning of non-parametric covers techniques that do not rely on data belonging to any particular distribution. These include, among others:...
. It is marketed by Cytel
Cytel
Headquartered in Cambridge, MA, USA, Cytel Inc. provides clinical trial design services and specialized statistical applications primarily for the biotech and pharmaceutical research markets....
Inc.