The license is generated based on a number for the named option and a file maps these features back to the name of the option. The option codes are specific to the option name and the Pro/ENGINEER config id, and can be found listed on the Pro/ENGINEER License Pack.
A test statistic is a standardized value that is calculated from sample data during a hypothesis test. You can use test statistics to determine whether to reject the null hypothesis. The test statistic compares your data with what is expected under the null hypothesis.
The statistic used to measure the validity is the same as the one to measure reliability, a correlation or Cohen's alpha . What is different is the types of scores being compared. To measure reliability, two (or more) sets of scores from the same individuals are taken using the same operational definition.