Certification results
Stata is extensively and continually tested for accuracy on all supported
platforms (Windows, Mac, Linux, etc.). A suite of tests, including
over 740,000 lines of test script, produces over 1.5 million lines of output
(as of 27 January 2009). This output is electronically compared to
previous runs of the test suite and against runs on other platforms. Any
differences are examined and resolved by Stata's statisticians and software
engineers before a new release of Stata (or any subsequent free updates) is
sent to users.
The actual number of tests is even larger than is indicated by the 1 million
lines of output. Many of the tests do not produce output but quietly do the
computations and compare the results against the correct results. If
results are outside accepted tolerance levels, the test fails and produces
error messages.
You can view the performance of Stata on the following well-known public
test suites:
- NIST StRD certification
results
Univariate summary statistics, linear regression, analysis of variance,
nonlinear regression.
- Diehard certification
results
Uniform (0,1) random-number generation
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