Nonna Zinoveva

There are investigated factors influencing the degree of test variants parallelism– the range of variation and the number of test tasks in a bank of tasks, the range of examinees’ proficiency and the number of test variants. The research was conducted within the framework of latent variables theory. The level of examinees’ proficiency and difficulty of test tasks are estimated in logits. The complex factorial experiment was fulfilled on the base of simulation. For statistical processing of the simulation experiment results the four-factorial analysis of variance was used. It is shown that degree of test variants parallelism mostly depends on the variation range of test tasks in the bank, then on the test length and the number of test variants. The number of test tasks in the bank does not influence parallelism of the test variants. Two two-factorial interactions are significant: the influence effect of test tasks variation range in the bank depends on the number of test tasks in the test and the influence effect of test tasks variation range in the bank depends also on number of the test variants.