Your all-rounder for evaluation!

The test statistical evaluation of items and exams is an indispensable part of modern quality assurance for exams. The EXAMINATOR is our control center for the automatic statistical evaluation as well as for the calculation of the results.


  • Automatic calculation of exam results

  • Automatic test statistical evaluation of individual items and entire exams

  • Automatic and variable calculation of the difficulty, discrimination index and selectivity of an item

  • Data can be exported back to the IMS and is displayed there in a user-friendly item overview.

  • Automatic feedback on items with conspicuous test statistical values

  • Seamless integration with popular UCAN tools

  • Inclusion of the test statistical evaluation for the selection of items in the public pool


Difficulty, Discrimination index and Discriminatory Power

The EXAMINATOR automatically calculates the distractor difficulty by measuring the relative frequency of the selections in the exam. In case of only one answer option, the distractor difficulty corresponds to the item difficulty.

The Discriminatory Power to the Pearson correlation of an answer to the sum of the points of all other items.

The discrimination index serves as an alternative indicator of discriminatory power. It measures the difference between the relative frequency of the selections and the upper and lower terzil of the total points of all test items.


  • 1. Overview of the test statistics in the IMS database

Evaluate Exams

  • Calculation of discriminatory power and difficulty for each exam

  • Analysis of discriminatory power and difficulty according to classifications and examination sections possible

  • Analysis by candidate attributes possible

Evaluate Questions/Items

  • Calculation of discriminatory power and difficulty for each question or item

  • The difficulty represents the average of the achieved points of a question

Evaluate Answers

  • For distractor analysis, the examiner calculates the distribution and discrimination index of the individual responses