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Ideally, all items have a difficulty greater than chance (P > 0.25 for items with four responses) and discriminability greater than 0.20 (D > 0.20), indicating the item successfully discriminates between high- and low-performing students (Crocker and Algina, 1986; Haladyna, 2004).
(The ride was made one degree of difficulty greater by stretches of gravelly or chewed-up pavement, and the presence of a handful of road construction crews. On the other hand, the construction mitigated the car traffic a bit).
Note that this estimation problem is an order of difficulty greater than that typically encountered in biostatistics where the doses are known.
Whether one kind occupies a greater space in his general activity than another depends on the difficulty, greater or lesser as the case may be, to overcome in attaining the useful effect aimed at.
In the Impact domain, the most difficult items (e.g., items with difficulty greater than 1) were clustered around the impact events induced by activities with exertion.
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At times of great difficulty, great things must be done.
Because I believe at times of great difficulty, great things can still be done.
I believe at times of great difficulty, great things can still be done.
Compared to previously reported population norms, participants had more psychological difficulties, greater disability, and lower quality of life.
The incident created "a period of great difficulty and great distress" for the campus, Kerwin said Thursday.
We knew the transition of a system toward another would not take place without great difficulty, without great crisis...
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