EXTREME PERSON SCORES

            Question:

How does RUMM2020 handle persons with extreme scores?

            Explanation:

There are two important points regarding extreme scores with Rasch analysis using RUMM2020:

• As part of any analysis proper in which item and person estimates are determined, RUMM2020 identifies extreme persons. These are persons with zero scores or 'perfect' scores ON THE ITEMS ATTEMPTED. These persons are retained throughout all analyses and included in many displays where an option to include or exclude such extreme persons is provided.
• Extreme persons are provided with an estimate of their location parameter. These estimates are derived from a geometric mean algorithm which uses, respectively, the three highest item location estimates [for the items attempted] and the three lowest item location estimates [for the zero score].

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