The hiking trails of over 100km are well signposted and maintained by the authorities with a website that provides details of each trail (difficulty level, point of interest, distance and more) and detailed, downloadable GPS maps.
For the first two sessions, the pseudo-words will be randomly presented to gain an idea of areas of difficulty for each participant.
(The quiz consists of three qualifying questions in increasing order of difficulty, each of which must be correctly answered within 10 seconds).
The control condition appeared on the computer screen in 70% of the trials, and the other three conditions, (a) distractor, (b) inhibition of response and (c) higher index of difficulty, each appeared in 10% of the trials.
The identification of the most discriminating items for each level of difficulty (Embretson and Reise, 2000) led to the selection of items which were more discriminating but still allowed for the assessment of a continuum of arithmetic ability.
This plot visualizes the location of each item's difficulty parameter (right panel) together with the distribution of all person parameters (left panel) along the same latent dimension.
For each of these domains, the top 10 GDT-TS scores for the first server models were averaged and used as a measure of each target's difficulty.
The Rasch measurement error for person scores is a function of the number of items and the targeting of each item's difficulty to the estimated person ability.
